Area = 0.555*sin(60) = 10.825 square m to 3 decimal places
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Well, well, well, look who's trying to flex their math muscles. If the perimeter of an equilateral triangle is 15m, that means all three sides are equal. So, divide 15m by 3 and voila, you get the length of each side - 5m. Math really can be a piece of cake, huh?
12.5m2
A right triangle with a hypotenuse of 10m and a base of 5m has an area of: 21.65m2
20 sq. m
Area of a triangle = b*h/2 = 5m*7m/2 = 35m2/2