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posted by kourtney on Thursday, May 12, 2011 at 3:46pm.
find the area of an eqilateral triangle with perimeter 45m
3*side length = 45m each side = 45/3 = 15m Height = 15m * sin(60°) = 15*(√3)/2 = 7.5√3 Area = 15m*7.5√3 /2 m = (225/4)√3 m²
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