Question

4. An isosceles triangle has sides that measure 7cm and 15cm. Find the third side of the

triangle, then find the perimeter.

Answer 1

Third side is 15cm. Perimeter is 37cm.

Explanation:

In a triangle sum of two sides is always greater than third side. Two sides of a isosceles triangle are equal.

So if the third side is 7cm

7+7=14cm which is less than 15 cm.

hence third side is 15 cm as

15+15=30cm which is greater than 7cm

15+7=22cm which is greater than 12cm

then

perimeter=15+7+15=37cm