Question

an isosceles triangle has perimeter 80 cm and each of the equal sides are 25 cm. Find the area of the triangle.

Answer 1

Your answer is:

Area = 306.19cm²

b Base 25 cm

P Perimeter 80 cm

A

Using the formulas

A=bhb

2

P=2a+b

hb=a2﹣b2

4

Solving forA

A=1

4bP(P﹣2b)=1

4·25·80·(80﹣2·25)≈306.18622cm²