The perimeter of an equilateral triangle is 318900 mm. What is the length of its side in decimeters?
| June 2, 2021 | education
Since the triangle is equilateral, its perimeter, equal to the sum of three sides, is equal to the product of the length of the side and three. That is: P = a + a + a = 3a, which means that the length of the side is:
a = P / 3 = 318900 mm / 3 = 106,300 mm.
Since there are 10 centimeters in one decimeter, and at the same time in one centimeter is equal to 10 millimeters, then:
a = 106300 mm = 106300/10 cm = 10630/10 dm = 10630 dm.
Answer: the side length is 1063 dm.
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