Geometry and TrigonometryEasySide of an equilateral triangle from its perimeter
Geometry and Trigonometry practice question
An equilateral triangle has a perimeter of 27 centimetres. What is the length, in centimetres, of each side?
Answer: 9
Three equal sides: 27/3 = 9.
Common wrong answers
- If you answered 81
- 81 is 27 × 3, multiplying instead of dividing.
- If you answered 13.5
- 13.5 is 27/2; a triangle has three sides.
- If you answered 6.75
- 6.75 is 27/4, as if the shape were a square.
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