# EXERCISE 10.1 EXERCISE 10.2

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1 NCERT Class 9 Solved Questions for Chapter: Circle 10 NCERT 10 Class CIRCLES 9 Solved Questions for Chapter: Circle EXERCISE 10.1 Q.1. Fill in the blanks : (i) The centre of a circle lies in of the circle. (exterior/ interior) (ii) A point, whose distance from the centre of a circle is greater than its radius lies in of the circle. (exterior/interior) (iii) The longest chord of a circle is a of the circle. (iv) An arc is a when its ends are the ends of a diameter. (v) Segment of a circle is the region between an arc and of the circle. (vi) A circle divides the plane, on which it lies in parts. Sol. (i) interior (ii) exterior (iii) diameter (iv) semicircle (v) the chord (vi) three Q.. Write True or False: Give reasons for your answers. (i) Line segment joining the centre to any point on the circle is a radius of the circle. (ii) A circle has only finite number of equal chords. (iii) If a circle is divided into three equal arcs, each is a major arc. (iv) A chord of a circle, which is twice as long as its radius, is a diameter of the circle. (v) Sector is the region between the chord and its corresponding arc. (vi) A circle is a plane figure. Sol. (i) True (ii) False (iii) False (iv) True (v) False (vi) True EXERCISE 10. Q.1. Recall that two circles are congruent if they have the same radii. Prove that equal chords of congruent circles subtend equal angles at their centres. Sol. Given : Two congruent circles with centres O and O. AB and CD are equal chords of the circles with centres O and O respectively. To Prove : AOB = COD Proof : In triangles AOB and COD, AB = CD [Given] AO = CO [Radii of congruent circle] BO = DO AOB CO D [SSS axiom] AOB CO D Proved. [CPCT] 81 Page - 01

2 Q.. Prove that if chords of congruent circles subtend equal angles at their centres, then the chords are equal. Ans. Given : Two congruent circles with centres O and O. AB and CD are chords of circles with centre O and O respectively such that AOB = CO D To Prove : AB = CD Proof : In triangles AOB and CO D, AO = CO BO = DO [Radii of congruent circle] AOB = CO D [Given] AOB CO D [SAS axiom] AB = CD Proved. [CPCT] EXERCISE 10.3 Q.1. Draw different pairs of circles. How many points does each pair have in common? What is the maximum number of common points? Ans. Maximum number of common points = Ans. Q.. Suppose you are given a circle. Give a construction to find its centre. Ans. Steps of Construction : 1. Take arc PQ of the given circle.. Take a point R on the arc PQ and draw chords PR and RQ. 3. Draw perpendicular bisectors of PR and RQ. These perpendicular bisectors intersect at point O. Hence, point O is the centre of the given circle. Q.3. If two circles intersect at two points, prove that their centres lie on the perpendicular bisector of the common chord. Ans. Given : AB is the common chord of two intersecting circles (O, r) and (O, r ). To Prove : Centres of both circles lie on the perpendicular bisector of chord AB, i.e., AB is bisected at right angle by OO. Construction : Join AO, BO, AO and BO. Proof : In AOO and BOO AO = OB (Radii of the circle (O, r) AO = BO (Radii of the circle (O, r )) OO = OO (Common) AOO BOO (SSS congruency) AOO = BOO (CPCT) Now in AOC and BOC AOC = BOC ( AOO = BOO ) AO = BO (Radii of the circle (O, r)) OC = OC (Common) 8 Page - 0

3 AOC BOC (SAS congruency) AC = BC and ACO = BCO...(i) (CPCT) ACO + BCO = 180..(ii) (Linear pair) ACO = BCO = 90 (From (i) and (ii)) Hence, OO lie on the perpendicular bisector of AB. Proved. EXERCISE 10.4 Q.1. Two circles of radii 5 cm and 3 cm intersect at two points and the distance between their centres is 4 cm. Find the length of the common chord. Sol. In AOO, AO = 5 = 5 AO = 3 = 9 OO = 4 = 16 AO + OO = = 5 = AO AO O = 90 [By converse of pythagoras theorem] Similarly, BO O = 90. AO B = = 180 AO B is a straight line. whose mid-point is O. AB = (3 + 3) cm = 6 cm Ans. Q.. If two equal chords of a circle intersect within the circle, prove that the segments of one chord are equal to corresponding segments of the other chord. Sol. Given : AB and CD are two equal chords of a circle which meet at E. To prove : AE = CE and BE = DE Construction : Draw OM AB and ON CD and join OE. Proof : In OME and ONE OM = ON [Equal chords are equidistant] OE = OE [Common] OME = ONE [Each equal to 90 ] OME ONE [RHS axiom] EM = EN...(i) [CPCT] Now AB = CD [Given] 1 AB = 1 CD AM = CN..(ii) [Perpendicular from centre bisects the chord] Adding (i) and (ii), we get EM + AM = EN + CN AE = CE..(iii) Now, AB = CD..(iv) AB AE = CD AE [From (iii)] BE = CD CE Proved. Q.3. If two equal chords of a circle intersect within the circle, prove that the line joining the point of intersection to the centre makes equal angles with the chords. Sol. Given : AB and CD are two equal chords of a circle which meet at E within the circle and a line PQ joining the point of intersection to the centre. To Prove : AEQ = DEQ 83 Page - 03

4 Construction : Draw OL AB and OM CD. Proof : In OLE and OME, we have OL = OM [Equal chords are equidistant] OE = OE [Common] OLE = OME [Each = 90 ] OLE OME [RHS congruence] LEO = MEO [CPCT] Q.4. If a line intersects two concentric circles (circles with the same centre) with centre O at A, B, C and D, prove that AB = CD (see Fig.) Sol. Given : A line AD intersects two concentric circles at A, B, C and D, where O is the centre of these circles. To prove : AB = CD Construction : Draw OM AD. Proof : AD is the chord of larger circle. AM = DM..(i) [OM bisects the chord] BC is the chord of smaller circle BM = CM..(ii) [OM bisects the chord] Subtracting (ii) from (i), we get AM BM = DM CM AB = CD Proved. Q.5. Three girls Reshma, Salma and Mandip are playing a game by standing on a circle of radius 5 m drawn in a park. Reshma throws a ball to Salma, Salma to Mandip, Mandip to Reshma. If the distance between Reshma and Salma and between Salma and Mandip is 6 m each, what is the distance between Reshma and Mandip? Sol. Let Reshma, Salma and Mandip be represented by R, S and M respectively. Draw OL RS, OL = OR RL OL = 5 3 [RL = 3 m, because OL RS] = 5 9 = 16 OL = 16 = 4 Now, area of triangle ORS = 1 KR 05 = 1 KR 05 Also, area of ORS = 1 RS OL = = 1 m 1 KR 5 = 1 KR = 1 4 = = 4.8 m 5 5 RM = KR RM = 4.8 = 9.6 m Hence, distance between Reshma and Mandip is 9.6 m Ans Page - 04

5 Q.6. A circular park of radius 0 m is situated in a colony. Three boys Ankur, Syed and David are siting at equal distance on its boundary each having a toy telephone in his hands to talk each other. Find the length of the string of each phone. Sol. Let Ankur, Syed and David be represented by A, S and D respectively. Let PD = SP = SQ = QA = AR = RD = x In OPD, OP = 400 x OP = 400 x AP = 400 x x [ centroid divides the median in the ratio : 1] = x Now, in APD, PD = AD DP x = (x) ( x ) x = 4x 9(400 x ) x = 4x x 1x = 3600 x = 3600 = x = 10 3 Now, SD = x = 10 3 = 0 3 ASD is an equilateral triangle. SD = AS = AD = 0 3 Hence, length of the string of each phone is 0 3 m Ans. EXERCISE 10.5 Q.1. In the figure, A, B and C are three points on a circle with centre O such that BOC = 30 and AOB = 60. If D is a point on the circle other than the arc ABC, find ADC. Sol. We have, BOC = 30 and AOB = 60 AOC = AOB + BOC = = 90 We know that angle subtended by an arc at the centre of a circle is double the angle subtended by the same arc on the remaining part of the circle. ADC = AOC ADC = 1 AOC = 1 90 ADC = 45 Ans. Q.. A chord of a circle is equal to the radius of the circle. Find the angle subtended by the chord at a point on the minor arc and also at a point on the major arc Page - 05

6 Sol. We have, OA = OB = AB Therefore, OAB is a equilateral triangle. AOB = 60 We know that angle subtended by an arc at the centre of a circle is double the angle subtended by the same arc on the remaining part of the circle. AOB = ACB ACB = 1 AOB = 1 60 ACB = 30 Also, ADB = 1 reflex AOB = 1 ( ) = = 150 Hence, angle subtended by the chord at a point on the minor arc is 150 and at a point on the major arc is 30 Ans. Q.3. In the figure, PQR = 100, where P, Q and R are points on a circle with centre O. Find OPR. Sol. Reflex angle POR = PQR = 100 = 00 Now, angle POR = = 160 Also, PO = OR [Radii of a circle] OPR = ORP [Opposite angles of isosceles triangle] In OPR, POR = 160 OPR = ORP = 10 [Angle sum property of a triangle]. Ans. Q.4. In the figure, ABC = 69, ACB = 31, find BDC. Sol. In ABC, we have ABC + ACB + BAC = 180 [Angle sum property of a triangle] BAC = 180 BAC = = 80 Also, BAC= BDC [Angles in the same segment] BDC = 80 Ans. Q.5. In the figrue, A, B, C and D are four points on a circle. AC and BD intersect at a point E such that BEC = 130 and ECD = 0. Find BAC. Sol. BEC + DEC = 180 [Linear pair] DEC = 180 DEC = = 50 Now, in DEC, DEC + DCE + CDE = 180 [Angle sum property of a triangle] CDE = 180 CDE = = 110 Also, CDE = BAC [Angles in same segment] BAC = 110 Ans Page - 06

10 collinear and therefore, LM = 6 cm. Let OL = x cm. Then OM = (6 x) cm Join OA and OC. Then OA = OC = r cm. Now, from right-angled OMA and OLC, we have OA = OM + AM and OC = OL + CL [By Pythagoras Theorem] r = (6 x) + 5..(i) and r = x (ii) (6 x) + 5 = x + 11 [From (i) and (ii)] 36 + x 1x = x x = x = x = x = 1 x = 1 Substituting x =1 in (i), we get r = (6 x) + 5 r = (6 1) + 5 r = (5) + 5 = r = 15 4 r = 5 5 Hence, radius r = 5 5 cm. Ans. Q.3. The lengths of two parallel chords of a circle are 6 cm and 8 cm. If the smaller chord is at distance 4 cm from the centre, what is the distance of the other chord from the centre? Sol. Let PQ and RS be two parallel chords of a circle with centre O. We have, PQ = 8 cm and RS = 6 cm. Draw perpendicular bisector OL of RS which meets PQ in M. Since, PQ RS, therefore, OM is also perpendicular bisector of PQ. Also, OL = 4 cm and RL = 1 RS RL = 3 cm and PM = 1 PQ PM = 4 cm In ORL, we have OR = RL + OL [Pythagoras theorem] 90 Page - 10

11 OR = = OR = 5 OR = 5 OR = 5 cm OR = OP [Radii of the circle] OP = 5 cm Now, in OPM OM = OP PM [Pythagoras theorem] OM = 5 4 = 5 16 = 9 OM = 9 = 3 cm Hence, the distance of the other chord from the centre is 3 cm. Ans. Q.4. Let the vertex of an angle ABC be located outside a circle and let the sides of the angle intersect equal chords AD and CE with the circle. Prove that ABC is equal to half the difference of the angles subtended by the chords AC and DE at the centre. Sol. Given : Two equal chords AD and CE of a circle with centre O. When meet at B when produced. To Prove : ABC = 1 ( AOC DOE) Proof : Let AOC = x, DOE = y, AOD = z EOC = z [Equal chords subtends equal angles at the centre] x + y + z = 36 [Angle at a point].. (i) OA = OD OAD = ODA In DOAD, we have OAD + ODA + z = 180 OAD = 180 z [ OAD = OBA] OAD = 90 z... (ii) Similarly OCE = 90 z... (iii) ODB = OAD + ODA OEB = 90 z + z [Exterior angle property] [From (ii)] ODB = 90 + z... (iv) Also, OEB = OCE + COE [Exterior angle property] OEB = 90 z + z [From (iii)] OEB = 90 + z... (v) Page Page - 11

12 Also, OED = ODE = 90 y O from (iv), (v) and (vi), we have BDE = BED = 90 + z y (vi) BDE = BED = y + z BDE = BED = y + z... (vii) BDE = 180 (y + z) ABC = 180 (y + z)... (viii) Now, y z 360 = y z y = 180 (y + z)... (ix) From (viii) and (ix), we have ABC = x y Proved. Q.5. Prove that the circle drawn with any side of a rhombus as diameter, passes through the point of intersection of its diagonals. Sol. Given : A rhombus ABCD whose diagonals intersect each other at O. To prove : A circle with AB as diameter passes through O. Proof : AOB = 90 [Diagonals of a rhombus bisect each other at 90 ] AOB is a right triangle right angled at O. AB is the hypotenuse of A B right AOB. If we draw a circle with AB as diameter, then it will pass through O. because angle is a semicircle is 90 and AOB = 90 Proved. Q.6. ABCD is a parallelogram. The circle through A, B and C intersect CD (produced if necessary) at E. Prove that AE = AD. Sol. Given : ABCD is a parallelogram. To Prove : AE = AD. Construction : Draw a circle which passes through ABC and intersect CD (or CD produced) at E. Proof : For fig (i) AED + ABC = 180 [Linear pair]... (ii) But ACD = ADC = ABC + ADE ABC + ADE = 180 [From (ii)]... (iii) From (i) and (iii) AED + ABC = ABC + ADE AED = ADE AD = AE [Sides opposite to equal angles are equal] Similarly we can prove for Fig (ii) Proved. Page - 1

13 Q.7. AC and BD are chords of a circle which bisect each other. Prove that (i) AC and BD are diameters, (ii) ABCD is rectangle. Sol. Given : A circle with chords AB and CD which bisect each other at O. To Prove : (i) AC and BD are diameters (ii) ABCD is a rectangle. Proof : In OAB and OCD, we have OA = OC [Given] OB = OD [Given] AOB = COD [Vertically opposite angles] AOB COD [SAS congruence] ABO = CDO and BAO = BCO [CPCT] AB DC... (i) Similarly, we can prove BC AD... (ii) Hence, ABCD is a parallelogram. But ABCD is a cyclic parallelogram. ABCD is a rectangle. [Proved in Q. 1 of Ex. 10.5] ABC = 90 and BCD = 90 AC is a diameter and BD is a diameter [Angle in a semicircle is 90 ] Proved. Q.8. Bisectors of angles A, B and C of a triangle ABC intersect its circumcircle at D, E and F respectively. Prove that the angles of the triangle DEF are 90 1 A, 90 1 B and 90 1 C. Sol. Given : ABC and its circumcircle. AD, BE, CF are bisectors of A, B, C respectively. Construction : Join DE, EF and FD. Proof : We know that angles in the same segment are equal. 5= C 1 = A 4 = A From (i), we have = C D= C and 6 = B and = C and 3 = B + B + B...(iv) But A + B + C = 180 B + C = 180 A..(i)..(ii)..(iii) [ = D] 93 Page - 13

14 B + C = 90 A (iv) becomes, D = 90 A. Similarly, from (ii) and (iii), we can prove that E = 90 B and F = 90 C Proved. Q.9. Two congruent circles intersect each other at points A and B. Through A any line segment PAQ is drawn so that P, Q lie on the two circles. Prove that BP = BQ. Sol. Given : Two congruent circles which intersect at A and B. PAB is a line through A. To Prove : BP = BQ. Construction : Join AB. Proof : AB is a common chord of both the circles. But the circles are congruent arc ADB = arc AEB APB = AQB Angles subtended BP = BQ [Sides opposite to equal angles are equal] Proved. Q.10. In any triangle ABC, if the angle bisector of A and perpendicular bisector of BC intersect, prove that they intersect on the circumcircle of the triangle ABC. Sol. Let angle bisector of A intersect circumcircle of ABC at D. Join DC and DB. BCD = BAD [Angles in the same segment] BCD = BAD 1 A [AD is bisector of A]...(i) Similarly DBC = DAC 1 A... (ii) From (i) and (ii) DBC = BCD BD = DC [sides opposite to equal angles are equal] D lies on the perpendicular bisector of BC. Hence, angle bisector of A and perpendicular bisector of BC intersect on the circumcircle of ABC Proved Page - 14

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