Question
If the perimeter of an equilateral triangle is 36 units,
then its area is (in square units):Solution
Perimeter = 36 units
Each side = 36 ÷ 3 = 12 units
Area of an equilateral triangle = (√3 / 4) × side²
= (√3 / 4) × 12²
= (√3 / 4) × 144
= 36√3 square units
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