Question

An isosceles triangle whose two equal sides are 15 cm and the third side is 20 cm long.

Answer 1

Step-by-step explanation:

We have,

Three sides13cm,13cm and 20cm.

By using Heron's formula

We need to get the semi-perimeter

s=

2

a+b+c

=

2

13+13+20

=

2

46

=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

=10

23×3

=83.07cm

2

Answer 2

Answer:50cm


Step-by-step explanation: