Question

using Heron's formula , ​

Answer 1

in an equilateral triangle perimeter is 162,

then ,

A+B+C=162

3A=162

A=B=C=54

S=A+B+C/2

S=81

by ,herons formula....

area=√S(S-A)(S-B)(S-C)

=√81(81-54)(81-54)(81-54)

=√81(27)(27)(27)

=27(9)√27

=27(9)√9(3)

=27(9)(3)√3

=729√3

=1261.17cm^2

I hope this helps you.......