# MATHEMATICS. IMPORTANT FORMULAE AND CONCEPTS for. Summative Assessment -II. Revision CLASS X Prepared by

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1 MATHEMATICS IMPORTANT FORMULAE AND CONCEPTS for Summative Assessment -II Revision CLASS X 06 7 Prepared by M. S. KUMARSWAMY, TGT(MATHS) M. Sc. Gold Medallist (Elect.), B. Ed. Kendriya Vidyalaya GaCHiBOWli Prepared by: M. S. KumarSwamy, TGT(Maths) Page - -

4 CLASS X : CHAPTER - 5 ARITHMETIC PROGRESSION (AP) IMPORTANT FORMULAS & CONCEPTS SEQUENCE An arrangement of numbers in a definite order according to some rule is called a sequence. In other words, a pattern of numbers in which succeeding terms are obtained from the preceding term by adding/subtracting a fixed number or by multiplying with/dividing by a fixed number, is called sequence or list of numbers. e.g.,,3,4,5 A sequence is said to be finite or infinite accordingly it has finite or infinite number of terms. The various numbers occurring in a sequence are called its terms. ARITHMETIC PROGRESSION ( AP ). An arithmetic progression is a list of numbers in which each term is obtained by adding a fixed number to the preceding term except the first term. This fixed number is called the common difference of the AP. It can be positive, negative or zero. Let us denote the first term of an AP by a, second term by a,..., nth term by a n and the common difference by d. Then the AP becomes a, a, a 3,..., a n. So, a a = a 3 a =... = a n a n = d. The general form of an arithmetic progression is given by a, a + d, a + d, a + 3d,... where a is the first term and d the common difference. nth Term of an AP Let a, a, a 3,... be an AP whose first term a is a and the common difference is d. Then, the second term a = a + d = a + ( ) d the third term a 3 = a + d = (a + d) + d = a + d = a + (3 ) d the fourth term a 4 = a 3 + d = (a + d) + d = a + 3d = a + (4 ) d Looking at the pattern, we can say that the nth term a n = a + (n ) d. So, the nth term a n of the AP with first term a and common difference d is given by a n = a + (n ) d. a n is also called the general term of the AP. If there are m terms in the AP, then a m represents the last term which is sometimes also denoted by l. nth Term from the end of an AP Let the last term of an AP be l and the common difference of an AP is d then the nth term from the end of an AP is given by l n = l (n ) d. Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 4 -

5 Sum of First n Terms of an AP The sum of the first n terms of an AP is given by n Sn [ a ( n ) d] where a = first term, d = common difference and n = number of terms. Also, it can be written as where a n = nth terms or n Sn [ a an ] n Sn [ a l] where l = last term This form of the result is useful when the first and the last terms of an AP are given and the common difference is not given.. Sum of first n positive integers is given by S n n( n ) Problems based on finding a n if S n is given. Find the nth term of the AP, follow the steps: Consider the given sum of first n terms as S n. Find the value of S and S by substituting the value of n as and. The value of S is a i.e. a = first term and S S = a Find the value of a a = d, common difference. By using the value of a and d, Write AP. Problems based on finding S n if a n is given. Find the sum of n term of an AP, follow the steps: Consider the nth term of an AP as a n. Find the value of a and a by substituting the value of n as and. The value of a is a = first term. Find the value of a a = d, common difference. By using the value of a and d, Write AP. By using Sn formula, simplify the expression after substituting the value of a and d. Arithmetic Mean If a, b and c are in AP, then b is known as arithmetic mean between a and c a c a c b i.e. AM between a and c is. Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 5 -

6 CLASS X : CHAPTER - 7 COORDINATE GEOMETRY IMPORTANT FORMULAS & CONCEPTS Points to remember The distance of a point from the y-axis is called its x-coordinate, or abscissa. The distance of a point from the x-axis is called its y-coordinate, or ordinate. The coordinates of a point on the x-axis are of the form (x, 0). The coordinates of a point on the y-axis are of the form (0, y). Distance Formula The distance between any two points A(x, y ) and B(x, y ) is given by AB ( x x ) ( y y ) or AB (difference of abscissae) (difference of ordinates) Distance of a point from origin The distance of a point P(x, y) from origin O is given by OP = x y Problems based on geometrical figure To show that a given figure is a Parallelogram prove that the opposite sides are equal Rectangle prove that the opposite sides are equal and the diagonals are equal. Parallelogram but not rectangle prove that the opposite sides are equal and the diagonals are not equal. Rhombus prove that the four sides are equal Square prove that the four sides are equal and the diagonals are equal. Rhombus but not square prove that the four sides are equal and the diagonals are not equal. Isosceles triangle prove any two sides are equal. Equilateral triangle prove that all three sides are equal. Right triangle prove that sides of triangle satisfies Pythagoras theorem. Section formula The coordinates of the point P(x, y) which divides the line segment joining the points A(x, y ) and B(x, y ), internally, in the ratio m : m are m x mx m y m y, m m m m This is known as the section formula. Mid-point formula The coordinates of the point P(x, y) which is the midpoint of the line segment joining the points A(x, y ) and B(x, y ), are x x, y y Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 6 -

7 Area of a Triangle If A(x, y ), B(x, y ) and C(x 3, y 3 ) are the vertices of a ABC, then the area of ABC is given by Area of ABC [ x ( y y3 ) x ( y3 y ) x3 ( y y )] Trick to remember the formula The formula of area of a triangle can be learn with the help of following arrow diagram: x y ABC = x x 3 y y 3 x y Find the sum of products of numbers at the ends of the lines pointing downwards and then subtract the sum of products of numbers at the ends of the line pointing upwards, multiply the difference by..e. Area of ABC [( x y x ) ( ] y3 x3 y x y3 x3 y x y Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 7 -

8 CLASS X : CHAPTER - 7 SOME APPLICATIONS TO TRIGONOMETRY IMPORTANT FORMULAS & CONCEPTS ANGLE OF ELEVATION In the below figure, the line AC drawn from the eye of the student to the top of the minar is called the line of sight. The student is looking at the top of the minar. The angle BAC, so formed by the line of sight with the horizontal, is called the angle of elevation of the top of the minar from the eye of the student. Thus, the line of sight is the line drawn from the eye of an observer to the point in the object viewed by the observer. The angle of elevation of the point viewed is the angle formed by the line of sight with the horizontal when the point being viewed is above the horizontal level, i.e., the case when we raise our head to look at the object ANGLE OF DEPRESSION In the below figure, the girl sitting on the balcony is looking down at a flower pot placed on a stair of the temple. In this case, the line of sight is below the horizontal level. The angle so formed by the line of sight with the horizontal is called the angle of depression. Thus, the angle of depression of a point on the object being viewed is the angle formed by the line of sight with the horizontal when the point is below the horizontal level, i.e., the case when we lower our head to look at the point being viewed Trigonometric Ratios (T - Ratios) of an acute angle of a right triangle In XOY-plane, let a revolving line OP starting from OX, trace out XOP=From P (x, y)draw PM to OX. In right angled triangle OMP. OM = x (Adjacent side); PM = y (opposite side); OP = r (hypotenuse). Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 8 -

9 Opposite Side sin y Hypotenuse r, Adjacent Side x cos, Hypotenuse r Hypotenuse r Hypotenuse cos ec, sec Opposite Side y r Adjacent Side x, Opposite Side y tan Adjacent Side x Adjacent Side x cot Opposite Side y Reciprocal Relations cos ec, sec and sin cos Quotient Relations sin cos tan and cot cos sin cot tan Trigonometric ratios of Complementary angles. sin (90 ) = cos cos (90 ) = sin tan (90 ) = cot cot (90 ) = tan sec (90 ) = cosec cosec (90 ) = sec. Trigonometric ratios for angle of measure. 0 0, 30 0,45 0, 60 0 and 90 0 in tabular form. A sina 0 cosa tana 0 3 coseca Not defined seca cota Not defined Not defined 3 Not defined Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 9 -

10 CLASS X : CHAPTER - 0 CIRCLES IMPORTANT FORMULAS & CONCEPTS Circle The collection of all the points in a plane, which are at a fixed distance from a fixed point in the plane, is called a circle. The fixed point is called the centre of the circle and the fixed distance is called the radius of the circle. In the below figure, O is the centre and the length OP is the radius of the circle. The line segment joining the centre and any point on the circle is also called a radius of the circle. A circle divides the plane on which it lies into three parts. They are: (i) inside the circle, which is also called the interior of the circle; (ii) the circle and (iii) outside the circle, which is also called the exterior of the circle. The circle and its interior make up the circular region. The chord is the line segment having its two end points lying on the circumference of the circle. The chord, which passes through the centre of the circle, is called a diameter of the circle. A diameter is the longest chord and all diameters have the same length, which is equal to two times the radius. A piece of a circle between two points is called an arc. The longer one is called the major arc PQ and the shorter one is called the minor arc PQ. The length of the complete circle is called its circumference. The region between a chord and either of its arcs is called a segment of the circular region or simply a segment of the circle. There are two types of segments also, which are the major segment and the minor segment. The region between an arc and the two radii, joining the centre to the end points of the arc is called a sector. The minor arc corresponds to the minor sector and the major arc corresponds to the major sector. In the below figure, the region OPQ is the minor sector and remaining part of the circular region is the major sector. When two arcs are equal, that is, each is a semicircle, then both segments and both sectors become the same and each is known as a semicircular region. Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 0 -

11 Points to Remember : A circle is a collection of all the points in a plane, which are equidistant from a fixed point in the plane. Equal chords of a circle (or of congruent circles) subtend equal angles at the centre. If the angles subtended by two chords of a circle (or of congruent circles) at the centre (corresponding centre) are equal, the chords are equal. The perpendicular from the centre of a circle to a chord bisects the chord. The line drawn through the centre of a circle to bisect a chord is perpendicular to the chord. There is one and only one circle passing through three non-collinear points. Equal chords of a circle (or of congruent circles) are equidistant from the centre (or corresponding centres). Chords equidistant from the centre (or corresponding centres) of a circle (or of congruent circles) are equal. If two arcs of a circle are congruent, then their corresponding chords are equal and conversely, if two chords of a circle are equal, then their corresponding arcs (minor, major) are congruent. Congruent arcs of a circle subtend equal angles at the centre. The angle subtended by an arc at the centre is double the angle subtended by it at any point on the remaining part of the circle. Angles in the same segment of a circle are equal.\ Angle in a semicircle is a right angle. If a line segment joining two points subtends equal angles at two other points lying on the same side of the line containing the line segment, the four points lie on a circle. The sum of either pair of opposite angles of a cyclic quadrilateral is 80. If the sum of a pair of opposite angles of a quadrilateral is 80, then the quadrilateral is cyclic. Secant to a Circle A secant to a circle is a line that intersects the circle at exactly two points. Tangent to a Circle A tangent to a circle is a line that intersects the circle at only one point. Prepared by: M. S. KumarSwamy, TGT(Maths) Page - -

12 Given two circles, there are lines that are tangents to both of them at the same time. If the circles are separate (do not intersect), there are four possible common tangents: If the two circles touch at just one point, there are three possible tangent lines that are common to both: If the two circles touch at just one point, with one inside the other, there is just one line that is a tangent to both: If the circles overlap - i.e. intersect at two points, there are two tangents that are common to both: If the circles lie one inside the other, there are no tangents that are common to both. A tangent to the inner circle would be a secant of the outer circle. Prepared by: M. S. KumarSwamy, TGT(Maths) Page - -

13 The tangent to a circle is perpendicular to the radius through the point of contact. The lengths of tangents drawn from an external point to a circle are equal. The centre lies on the bisector of the angle between the two tangents. If a line in the plane of a circle is perpendicular to the radius at its endpoint on the circle, then the line is tangent to the circle. Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 3 -

14 CLASS X : CHAPTER - CONSTRUCTONS IMPORTANT CONCEPTS To construct a triangle similar to a given triangle as per given scale factor. Example - Construct a triangle similar to a given triangle ABC with its sides equal to 3 4 of the corresponding sides of the triangle ABC (i.e., of scale factor 3 4 ). Steps of Construction : Draw any ray BX making an acute angle with BC on the side opposite to the vertex A. Locate 4 (the greater of 3 and 4 in 3 4 ) points B, B, B 3 and B 4 on BX so that BB = B B = B B 3 = B 3 B 4. Join B 4 C and draw a line through B3 (the 3rd point, 3 being smaller of 3 and 4 in 3 ) parallel to 4 B 4 C to intersect BC at C. Draw a line through C parallel to the line CA to intersect BA at A (see below figure). Then, Δ A BC is the required triangle. Example : Construct a triangle similar to a given triangle ABC with its sides equal to 5 3 of the corresponding sides of the triangle ABC (i.e., of scale factor 5 3 ). Steps of Construction : Draw any ray BX making an acute angle with BC on the side opposite to the vertex A. Locate 5 points (the greater of 5 and 3 in 5 3 ) B, B, B3, B4 and B5 on BX so that BB = B B = B B 3 = B 3 B 4 = B 4 B 5. Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 4 -

15 Join B 3 (the 3rd point, 3 being smaller of 3 and 5 in 5 3 ) to C and draw a line through B 5 parallel to B 3 C, intersecting the extended line segment BC at C. Draw a line through C parallel to CA intersecting the extended line segment BA at A (see the below figure). Then A BC is the required triangle. To construct the tangents to a circle from a point outside it. Given : We are given a circle with centre O and a point P outside it. We have to construct two tangents from P to the circle. Steps of construction : Join PO and draw a perpendicular bisector of it. Let M be the midpoint of PO. Taking M as centre and PM or MO as radius, draw a circle. Let it intersect the given circle at the points A and B. Join PA and PB. Then PA and PB are the required two tangents. To Construct a tangent to a circle at a given point when the centre of the circle is known. We have a circle with centre O and a point P anywhere on its circumference. Then we have to construct a tangent through P. Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 5 -

16 Steps of Construction : Draw a circle with centre O and mark a point P anywhere on it. Join OP. Draw a perpendicular line through the point P and name it as XY, as shown in the figure. XY is the required tangent to the given circle passing through P. Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 6 -

17 CLASS X : CHAPTER - AREAS RELATED TO CIRCLES IMPORTANT FORMULAS & CONCEPTS Perimeter and Area of a Circle Perimeter/circumference of a circle Area of a circle = πr, where 7 = π diameter = π r (where r is the radius of the circle) = πr Areas of Sector and Segment of a Circle Area of the sector of angle θ r, where r is the radius of the circle and θ the angle of the sector in degrees length of an arc of a sector of angle θ r, where r is the radius of the circle and θ the angle of the sector in degrees Area of the segment APB = Area of the sector OAPB Area of Δ OAB r area of Δ OAB Area of the major sector OAQB = πr Area of the minor sector OAPB Area of major segment AQB = πr Area of the minor segment APB Area of segment of a circle = Area of the corresponding sector Area of the corresponding triangle Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 7 -

18 CLASS X : CHAPTER - 3 SURFACE AREAS AND VOLUMES IMPORTANT FORMULAS & CONCEPTS Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 8 -

19 Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 9 -

20 CLASS X : CHAPTER - 5 PROBABILITY IMPORTANT FORMULAS & CONCEPTS PROBABILITY Experimental or empirical probability P(E) of an event E is P(E) = Number of trials in which the event happened Total number of trials The theoretical probability (also called classical probability) of an event A, written as P(A), is defined as Number of outcomes favourable to A P(A) = Number of all possible outcomes of the experiment Two or more events of an experiment, where occurrence of an event prevents occurrences of all other events, are called Mutually Exclusive Events. COMPLIMENTARY EVENTS AND PROBABILITY We denote the event 'not E' by E. This is called the complement event of event E. So, P(E) + P(not E) = i.e., P(E) + P( E ) =, which gives us P( E ) = P(E). In general, it is true that for an event E, P( E ) = P(E) The probability of an event which is impossible to occur is 0. Such an event is called an impossible event. The probability of an event which is sure (or certain) to occur is. Such an event is called a sure event or a certain event. The probability of an event E is a number P(E) such that 0 P (E) An event having only one outcome is called an elementary event. The sum of the probabilities of all the elementary events of an experiment is. DECK OF CARDS AND PROBABILITY A deck of playing cards consists of 5 cards which are divided into 4 suits of 3 cards each. They are black spades ( ) red hearts ( ), red diamonds ( ) and black clubs ( ). The cards in each suit are Ace, King, Queen, Jack, 0, 9, 8, 7, 6, 5, 4, 3 and. Kings, Queens and Jacks are called face cards. Prepared by: M. S. KumarSwamy, TGT(Maths) Page - 0 -

21 Equally likely events : Two or more events are said to be equally likely if each one of them has an equal chance of occurrence. Mutually Exclusive events : Two or more events are mutually exclusive if the occurrence of each event prevents the every other event. Complementary events : Consider an event has few outcomes. Event of all other outcomes in the sample survey which are not in the favourable event is called Complementary event. Exhaustive events : All the events are exhaustive events if their union is the sample space. Sure events : The sample space of a random experiment is called sure or certain event as any one of its elements will surely occur in any trail of the experiment. Impossible event : An event which will occur on any account is called an impossible event. Prepared by: M. S. KumarSwamy, TGT(Maths) Page - -

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