# Chapter 12 : Isosceles Triangle - Frank Solutions for Class 9 Maths ICSE

Mathematics in ICSE Class 9 is one of the most challenging and trickiest subjects of all. It includes complex topics such as logarithms, expansions, indices and Pythagoras Theorem which are difficult to understand for an average student. TopperLearning provides study materials for ICSE Class 9 Mathematics to make the subject easy and help students to clear all their concepts. Our study materials comprise numerous video lessons, question banks, revision notes and sample papers which help achieve success in the examination.

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## Chapter 12 - Isosceles Triangle Excercise Ex. 12.1

Question 1 Solution 1 Question 2 Solution 2 Question 3 Solution 3 Question 4

Find the interior angles of the following triangles: Solution 4  Question 5

Find the interior angles of the following triangles: Solution 5  Question 6

Find the interior angles of the following triangles: Solution 6  Question 7

Find the interior angles of the following triangles: Solution 7  Question 8 Solution 8 Question 9 Solution 9 Question 10 Solution 10 Question 11 Solution 11 Question 12 Solution 12 Question 13 Solution 13 Question 14 Solution 14 Question 15 Solution 15 Question 16 Solution 16 Question 17 Solution 17 Question 18 Solution 18 Question 19 Solution 19 Question 20 Solution 20 Question 21 Solution 21 Question 22 Solution 22 Question 23

In the given figure, D and E are points on AB and AC respectively. AE and CD intersect at P such that AP = CP. If BAE = BCD, prove that DBDE is isosceles. Solution 23  Question 24

In DPQR as shown, PQS = RQS and QS PR. Find the value of x and y, if PQ = 3x + 1; QR = 5y - 2; PS = x + 1 and SR = y + 2. Solution 24  Question 25

In the given figure :

if PQS = 60o,

a. find QPR.

b. show that PQ = PS = QS = SR

Solution 25 Question 26

In the give figure, if DPQR is an isosceles triangle, prove that: QSR = exterior PRT. Solution 26  Question 27

In the given figure, if DABC is an isosceles triangle and PAC = 110o, find the base angle and vertex angle of the DABC. Solution 27  ## Key Features of Study Materials for ICSE Class 9 Maths:

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