Question

using heron's formula find the area of an equilateral triangle whose perimeter is 90 cm​

Answer 1

Answer:

√3(90)²/4 hope this helps you

Answer 2

Step-by-step explanation:

perimeter of equilateral triangle=90 cm

let a be the side of triangle,

therefore, 3a=90

a=30cm

now area of equilateral triangle by heron's formula=

√3a²/4

=√3×30×30/4

=√3×15×15

=225√3 cm ²

therefore the area of the equilateral triangle is 225√3 cm ²