Question

Q.9- Find the area of an isosceles triangle each of whose equal sides measures 13cm and whose base measures 20cm.​

Answer 1

Answer:

83.07cm2

Step-by-step explanation:

We have,

Three sides13cm,13cm and 20cm.

By using Heron's formula

We  need to get the semi-perimeter

s=2a+b+c=213+13+20

=246=23

Now,

put the  heron's formula,

s=s(s−a)(s−b)(s−c)

=23(23−13)(23−13)(23−20)

=23×10×10×3

=1023×3

=83.07cm2