Question

Area of an equilateral triangle is 81√3 cm^2. Find its perimeter.

Answer 1

Answer:

Given that 

we know that area is √3/4 a² 

area of the equilateral triangle = 81√3

√3/4 a² = 81√3

1/4 a² = 81

a² = 81(4)

a² = 324

a = 18cm

then the perimeter of the equilateral triangle = 3×a

                                                                           = 3×18

                                                                           =54cm.

✔️Hope it will be helpful.✔️

Answer 2

Answer:

54 cm

Step-by-step explanation:

see the pic for solution