Posted by kourtney on .
find the area of an eqilateral triangle with perimeter 45m

honors geometry 
MathMate,
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