Question

the perimeter of an isosceles triangle is 30 cm and each equal side is equal to 12 cm, find its base​

Answer 1

Its  AmitBhai Here !

SOLUTION

Length of the equal sides = 12cm

Perimeter of the triangle = 30cm

Length of the third side = 30 - (12+12) cm = 6cm

Semi perimeter of the triangle(s) = 30/2 cm = 15cm

Using heron's formula,

Area of the triangle = √s (s-a) (s-b) (s-c)

                                      = √15(15 - 12) (15 - 12) (15 - 6)cm2

                                      = √15 × 3 × 3 × 9 cm2

                                      = 9√15 cm2