Question

The length of each side of an equilateral triangle is 74mm, correct to the nearest millimeter. Calculate the smallest possible perimeter of the triangle

Answer 1

221 mm

Explanation:

The dimension 74 mm is presumed to mean that the actual length could be anywhere in the interval [73.5, 74.5). So, the minimum perimeter is ...

3 × 73.5 = 220.5 ≈ 221 . . . millimeters

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The perimeter of an equilateral triangle is 3 times the side length, since all three sides of the triangle are the same length.