Question

Two sides of an isosceles triangle are 18cm and 7cm.What is the measure of the third side? Write your answer with proper justification.

Answer 1

Answer:

If the third side is assumed to be 3

the the cos of the angle opposite the side of size 7 is given by

cos C = [a^2+b^2-c^2]/[2ab]

cos C = [3^2+3^2 -7^2][2(3)(3_] = -31/18

31/18>1 but cos C =1 when a maximum

The required side must be 7

Answer 2

Answer:

7 is the ans of the following question