18. The perimeter of an equilateral triangle is 60 m. Find its are
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answer 100√3
Step-by-step explanation:
perimeter of an equilateral ∆ = 60m
3a = 60
a = 60/3
a = 20 m
area of a equilateral ∆ = √3/4 a square
= √3/4 ×20 ×20
= √3 ×5×20
100√3
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