Question

find the perimeter of an equilateral triangle whose area is equal to that of a triangle with sides 21 CM 16 cm and 13 cm

Answer 1

here use heron formula
s=a+b+c/2
s=21+16+14/2
s=50/2
s=25
using under the root(s-a)+s-b+s-c
then u can solve easily