3 x 18 = 54
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Find the area of an equilateral triangle if its perimeter is 18 ft
Given a perimeter of 18 units, the resulting altitude is 5.2 (5.19615) units.
18
x+4+x+2+x = 24 3x+6 = 24 3x = 24-6 3x = 18 x = 6 longest side = 10 inches
3 cm x 6 sides = 18 cm perimeter