The perimeter of the square is 20 dm. What is the perimeter of an equilateral triangle on the long side, like a square?
| December 19, 2020 | education
First you need to calculate the length of side A of the square. According to the formula of the perimeter of the square, P = 4 × A => A = P ÷ 4 = 20 ÷ 4 = 5 dm. The perimeter of an equilateral triangle is P = 3 × A = 3 × 5 = 15 dm.
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