Question

Find the area of an equilateral triangle whose perimeter is 36cm.​

Answer 1

A=3

4a2

P=3a

Solving forA

A=3P2

36=3·362

36≈62.35383cm²

Answer 2

Answer:

perimeter of equilateral triangle :- p = 3a

36cm = 3×side

36÷3 = side

12cm = side.

now,

      area of equilateral triangle:- A = √3÷4×$a^{2}$

                                                     A  = √3÷4 × $12^{2}$

                                                    A = 36√3

   so, area of equilateral triangle is 36√3  

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Step-by-step explanation: