AlgebraMediumLargest whole-number side under a perimeter cap
Algebra practice question
The perimeter of an equilateral triangle is at most 50 centimetres. If the side length is a whole number of centimetres, what is the largest possible side length?
Answer: 16
3s ≤ 50 gives s ≤ 16.67, so the largest whole number is 16.
Common wrong answers
- If you answered 17
- 17 gives a perimeter of 51, over the cap.
- If you answered 25
- 25 halves 50 as if the triangle had two sides.
- If you answered 12.5
- 12.5 uses four sides.
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