Question

Please answer this question.

Answer 1

Given : Let ABC an equilateral ∆ whose perimeter is 180 cm

To Find : area ∆ ABC

Solution:

AB=BC=CA= a

180 = a+a+a

a = 180/3

a = 60 cm

S = 180/2= 90 cm( semi perimeter

A= √ 90(90-60)(90-60)(90-60)

A= √ 90×30×30×30

A= √ 9×3×3×3×10000

A= 3×3×100√3

A=900√3 cm²

Area is 900×(1.732)=1558.8 cm²

Answer 2

Hello dear your answer



Thanks!!