The perimeter of an equilateral triangle is 60m. It's area is. (a) 10√3 m² (b) 15√3m² (c) 2055m² (d) 100√3 m².
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perimeter =60
side=60/3=20
__
area=)3 /4× 20×20
=5×20root 3
100 root 3
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