Question

The perimeter of equilateral triangle is 180cm find area

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Answer 1

a = b = c

p = 3a

3a = 180

a = 60 cm

s=p/2 = 180/2 = 90

`√(s (s - a)(s - b)(s - c))`

A^2 = 90(90- 60) (90 -60)(90-60)

A^2= 90 x 30 x 30 x 30

A = 30 radical 3 cm^2