Question

find the area of an equilateral triangle whose perimeter is 60 cm

Answer 1

perimeter =60

1 side = 60/3

√s(s-a)(s-b)(s-c)

s=30

√30(30-20)(30-20)(30-20)

=√30x10x10x10=√30000 cm square

=100√3 cm square hope it helps