QuestioN :

Find the area of an isosceles triangle each of whose equal sides measures 13 cm and whose base measures 20 cm.

GiveN :

• Sides measures = 13cm
• Base measures = 20cm

To FiNd :

• The area of an isosceles triangle

ANswer :

The area of an isosceles triangle is 83.07 cm²

SolutioN :

We have,

Three sides 13cm, 13cm and 20cm.

By using Heron's formula

We  need to get the semi-perimeter

Now,

put the  heron's formula,

∴Hence, The area of an isosceles triangle is 83.07 cm²

83.07 cm² is the answer.

Hope this will help you :)