# Chapter 8 Similar Triangles

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1 Chapter 8 Similar Triangles Key Concepts:.A polygon in which all sides and angles are equal is called a regular polygon.. Properties of similar Triangles: a) Corresponding sides are in the same ratio b) Corresponding angles are equal 3.All regular polygons having the same number of sides are always similar 4.All squares and equilateral triangles are similar. 5.All congruent figures are similar but all similar figures need not be congruent. 6.Thales Theorem (Basic proportionality Theorem): If a line is drawn parallel to one side of a triangle to intersect the other two sides in distinct points, then the other two sides are divided in the same ratio. 7.If a line divides two sides of a triangle in the same ratio. Then the line is third side. parallel to the 8.AAA criterion for similarity: In two triangles, if the angles are equal, then the sides opposite to the equal angles are in the same ratio (or proportional) and hence the two triangles are similar. 9.SSC criterion for similarity: if in two triangles the sides of one triangle are proportional to the sides of the other triangle, then their corresponding angles are equal and hence the triangles are similar.

2 0.SAS criterion for similarity: if one angle of a triangle is equal to one angle of the other triangle and the sides including these angles are proportional, then the two triangles are similar..if the areas of two similar triangles are equal, then they are congruent..pythagoras theorem (Baudhayan Theorem): In a right angle triangle, the square hypotenuse is equal to the sum of the squares of the other two sides. of. In ABC, DE//BC and AD 3 DB, AC 5.6. Find AE. 5 Sol: In ABC, DE//BC AD AE DB EC (By Th hales Theorem) AD 3 DB 5 ( Given ) AE, so EC Short Questions 3 5 Given AC 5.6; AE : EC 3:5 AE 3 AC AE 5 AE AE 5

3 5AE 3 (5.6 - AE) (cross multiplication) 8AE AE. cm 8.In a trapezium ABCD, AB//DC. E and F are points on non parallel sides AD and BC respectively such that EF//AB show that AE BF ED FC. A. Let us join AC to intersect EF at G. AB//DC and EF//AB (Given) EF//DC (Lines parallel to the same line are parallel to each other) In ABC, EG//DC So, AE AG ED GC (By Thales Theorem) () Similarly In CAB GF//AB CG CF GA FB (By Thales Theorem) AG BF () GC FC From () and () AE BF ED FC

4 3.Prove that in two triangles, if the angles are equal, then the sides opposite to the equal angles are in the same ratio (or proportional) and hence the two triangles are similar. Sol: Given: In triangles ABC and DEF A D, B E and C F RTP: AB BC AC DE EF DF Construction: locate points P and Q on DE and DF respectively such that and AC DQ. Join PQ. AB DP Proof: ABC DPQ B P E and PQ//EF

5 DP DQ PE QF AB AC i. e DE DF Similarly AB DE Hence proved BC EF and so AB BC AC DE EF DF 4. Prove that if the areas of two similar triangles are equal then they are congruent. Sol: ABC PQR So ar( ABC ) AB BC AC ar ( PQR ) PQ QR PR But ar( ABC) ar( PQR) (areas are equal) AB BC AC PQ QR PR So AB PQ ; BC QR ; AC PR From which we get AB PQ, BC QR, AC PR ABC PQR (by SSS congruency)

6 5.In a right angle triangle the square of hypotenuse is equal to the sum of the squares of the other two sides (Pythagoras theorem, (BAUDHAYAN THEOREM)). Sol: Given: ABC is a right angle triangle RTP: Ac AB + BC Construction: Draw BD AC Proof: ADB ABC AD AB AB AC (sides are proportional) AD.AC AB () Also BDC ABC CD BC BC AC CD.AC BC () () + () AD.AC + CD.AC AB +BC AC (AD + CD) AB +BC AC.AC AB +BC AC AB + BC C

7 6.The ratio of the areas of two similar triangles is equal to the ratio of the of their corresponding sides. squares Sol: Given: ABC PQR RPT: ar( ABC ) AB BC AC ar( PQR) PQ QR RP Construction: Draw AM BC and PN QR Proof: BC AM ar( ABC ) BC AM () ar( PQR) QR PN QR PN In ABM & PQN B Q ( ABC PQR) M N 90 ABM ~ PQN (by AA similarity) AM PN AB () PQ also ABC & PQR (Given) AB BC AC (3) PQ QR PR

8 ar( ABC) AB AB now ar( PQR) PQ PQ [ (),() &(3)] AB PQ Now by using (3), we get ar( ABC ) AB BC AC ar( PQR) PQ QR PR Hence proved 7.Prove that the sum of the squares of the sides of a Rhombus is equal to the sum & squares of its diagonals. Sol: in rhombus ABCD AB BC CD DA and Diagonals of rhombus perpendicularly bisect each other at o A So, OA OC OA BD OB OD OD In AOD, AOD 90 AD OA + OD (Pythagoras Theorem) AC BD +

9 AC BD AD AC + BD 4 4AD AC + BD AD + AD + AD + AD AC + BD But AB BC CD AD (Given) AB + BC + CD + DA AC + BD 8.Prove that a line drawn through the mid-point of one side of a triangle parallel to another side bisects the third side (using basic proportionality theorem) Sol: Given: In ABC, D is the mid-point of AB and DE//BC To prove: AE CE Proof: by Thales theorem AD AE () DB EC But D is the mid point of AB AD DB

10 AD DB From () we get AE EC AE CE AC is bisected by the parallel line 9.Prove that the ratio of areas of two similar triangles is equal to the square of the ratio of their corresponding medians. Sol: Given: ABC DEF and AM and DN are their corresponding medians. To prove: ar( ABC) AM ar( DEF ) DN Proof: It is given that A ABC DEF By the theorem an areas of similarity triangles ar( ABC) AB ar( DEF ) DE AB BC AC () DE EF DE Also AB BC BM BM DE EF EN EN

11 AB BM DE EN Clearly ABM DEN SAS similarity criterion, ABC DEF AB DE AM () DN From () and () we get ar( ABC) AM ar( DEF ) DN Hence proved 0.A person.65m tall casts..8m shadow. At the same instance, a lamp- posts casts a shadow of 5.4m. Find the height of the lamppost? Sol: In ABC and PQR B Q 90 C R AC//PR, (all sun s rays are parallel at any instance) ABC PQR (by AA similarly) AB BC (corresponding parts of similar triangles ) PQ QR

12 .65.8 PQ PQ 4.95m.8 Height of the lamp post 4.95m.. The perimeters of two similar triangles are 30cm and 0cm respectively. If one side of the first triangle is cm, determine the corresponding side of the second triangle Sol: Let the corresponding side of the second triangle be x m We know that, The ratio of perimeters of similar triangles ratio of corresponding sides 30 x 8cm 0 x Corresponding side of the second triangle 8cm. ABC DEF and their areas are respectively 64cm and cm If EF 5.4 cm, Then Find BC. Sol: ( ) ( ) ar ABC BC ar DEF EF 64 BC BC BC. cm 5.4

13 3. ABC DEF, BC 3cm, EF 4cm and area of ABC 54cm area of DEF. Determine the Sol: ABC DEF BC 3cm, EF 4cm Area of ABC 54cm By the theorem on areas of similar triangles, ( ) ( ) ar ABC BC ar DEF EF ( ) 54cm 9cm ar DEF 6cm Area of DEF 96 cm 4.The areas of two similar triangles are 8cm and 49 cm respectively. If the altitude of the bigger triangle is 4.5cm. Find the corresponding altitude of the similar triangle. Sol: We know that the ratio of areas of two similar triangles is equal to square of the ratio of their corresponding altitudes area of bigger triangle altitudeof bigger triangle area of smaller triangle altitudeof smaller triangle x 3.5cm 49 x Corresponding altitude of the smaller triangle 3.5cm.

14 5.A ladder 5m long reaches a window of building 0m above the ground. Determine the distance of the foot of the ladder from the building. Sol: In ABC, C 90 AB AC + BC (By Pythagoras Theorem) BC BC m BC 5 5m The distance of the foot of the ladder from the building is 5m. 6.The hypotenuse of a right triangle is 6m more than twice of the shortest side if the third side is m less than the hypotenuse. Find the sides of the triangle. Sol: Let the shortest side be x m Then hypotenuse (x + 6) m, third side (x + 4)m By Pythagoras Theorem we have (x + 6) x + (x + 4) 4x x x + 4x x x 8x 0 0 (x - 0) (x + ) x +0, x -

16 Essay Type Questions.Prove that if a line is drawn parallel to one side of a triangle to intersect the other two sides in distinct points then the other two sides are divided in the same Ratio (proportionality theorem / Thales Theorem). Sol: Given: In ABC, DE/ //BC which intersects sides AB and AC at D and E respectively RTP: AD AE DB EC Construction: Join B, E and C, D and then draw DM AC and EN AB Proof: Area of ADE AD EN Area of BDE BD EN SO Area of Area of ADE BDE AD EN AD () BD EN BD Again Area of ADE AE DM

17 Area of CDE EC DM ar ar ( ABE ) ( CDE ) AE DM EC DM AE CE ( ) Observe that BDEE and CDE are on the same base DE and between same parallels BC and DE So ar ( BDE) ar ( CDE) (3) From () () & (3) we have AD AE DB CE Hence proved.in the given figure LM//AB AL x 3, AC x, BM x and BC x + 3 find the value of x. Sol: in ABC, LM//AB AL BM LC MC (By Th hales Theorem) x 3 x x ( x 3) (x + 3) ( x )

18 x 3 x ( x + 3) x + 5 (crosss multiplication) (x - 3) (x + 5) (x - ) (x + 3) x + x 5 x + x 6 x x x What values of x will make DE//AB in the given figure. Sol: In ABC, DE//AB CD CE AD CB x + 3 x 8x + 9 3x + 4 (x + 3) (3x + 4) x (8x + 9) 3x + 3x + 8x + 9x 5x 4x 0 (x ) (5x + 6) 0 x ; x 6 5

19 4.In ABC, DE//BC, AD x, DB x -, AE x + and EC x Find value of x. Sol: In ABC, DE//BC AD AE (by thales theorem) PB AC x x + x x x(x - ) (x + ) (x - ) x x x 4 x 4. 5.In PQR, ST is a line such that PS PT and PST PRQ prove that SQ TR PQR is isosceles triangle. Sol: In PQR, ST is a line such that PS PT and PST PRQ SQ TR

20 By the converse theorem of Thales, ST//QR PST PQR (corresponding angles) () PQR PRQ (Given) () From () and () we get PST PRQ PQ QR (sides opposite to the equal angles) PQR is an isosceles triangle 6.Prove that a line drawn through the mid-point of one side of a Triangle parallel to another side bisects the third side (using basic proportionality theorem) Sol: In ABC, D is the mid-point of AB and DE//BC To prove: AE EC AD AE (By Thales theorem) () DB EC But D is the mid-point of AB AD DB AD DB AE EC from ()

21 AE EC AC is bisected by the parallel line. One Mark Questions. Define regular polygon? A. A polygon in which all sides and angles are equal is called a regular polygon.. Write the properties of similar triangles? A. Corresponding sides are in the same ratio corresponding angles are equal 3. Which figures are called similar figures? A. The geometrical figures which have same shape but not same size. 4. Which figures are called congruent figures? A. The geometrical figures which have same size and same shape. 5. When do you say that two triangles are similar? A. Two triangles are said to be similar if their i) Corresponding angles are equal ii) Corresponding sides are in the same ratio. 6. Sides of two similar triangles are in the ratio :3. Find the ratio of the areas of the triangle A. 4 : 9 7. Write the basic proportionality theorem. A. If a line is drawn parallel to one side of a triangle to intersect the other two sides in distinct points, then the other two sides are divided in the same ratio.

22 8. Write the converse of basic proportionality theorem. A. If a line divides two sides of a triangle in the same ratio, then the line is parallel to the third side 9. Write AAA axiom. A. In two triangles, if the angles are equal, then the sides opposite to the equal angles are in the same ratio (or proportion) and hence the two triangles are similar. 0. Write SSS criterion A. If in two triangles the sides of one triangle are proportional to the sides of the other triangle, then their corresponding angles are equal and hence the triangles are similar.. Write SAS criterion. A. If one angle of a triangle is equal to one angle of another triangle and the sides including these angles are proportional, then the two triangles are similar.. State Pythagoras theorem A. In a right triangle, the square of hypotenuse is equal to the sum of the squares of the other two sides. 3. Which is the longest side in a right triangle? A. Hypotenuse 4. If the side of an equilateral triangle is a then find height? A. 3 a units

23 Fill in the Blanks. In ABC if D 90 and BD AC then BD. All squares and equilateral triangles are 3. Example of similar figures is 4. Example of non similar figures is 5. If a line divides two sides of a triangle in the same ratio. Then the line is parallel to the 6. In ABC, BC + AB AC Then is a right angle 7. If D is the midpoint of BC in ABC then AB + AC 8. In ABC, D and E are mid points of AB and AC then DE : BC is. 9. The diagonal of a square is times to its side 0. If ABC ~ PQR Than AB : AC. The ratio of corresponding sides of two similar triangles is 3 : 4 Then the ratio of their areas is. Basic proportionality theorem is also known as theorem 3. Area of an equilateral triangle is 4. is the longest side of right angled triangle. Key ) AD.DC; ) Similar; 3) Bangles if different sizes, any two squares; 4) Any two walls, square and rhombus; 5) Third side; 6) B; 7) AD + BD ; 8) :; 9) ; 0) PQ : PR; ) 9 : 6; ) Thales; 3) 3 4 a ; 4) Hypotenuse.

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