Question

the base of an isosceles triangle is 18cm and it's area is 108cm².Find it's perimeter​

Answer 1

base = 18 cm

height = x cm

area of a triangle = 1/2 × b × h

A.T.Q

1/2 ×18 × x = 108

9x=108

x=12 cm

perimeter = 18 + 12 + 12 = 42 cm