Question

Sides of a triangle de Tulu un
An isosceles triangle has perimeter 30 cm and each of the equal sides is 12 cm. Find
the area of the triangle​

Answer 1

Answer:

9$\sqrt{15}$

Step-by-step explanation:

Perimeter=30 cm

Two equal sides=12 cm each

Perimeter=Sum of all sides

Let the unknown side be x

Therefore

30cm=12cm+12cm+x

30cm-24cm=x

x=6cm

s=(a+b+c)/2

=12+12+6/2

=30/2

=15cm

Area of triangle=$\sqrt (s(s-a)(s-b)(s-c))$

                         =$\sqrt(15*3*3*9)$

                          =$\sqrt(3*5*3*3*3*3)$

                          =9$\sqrt15$