Geometry and TrigonometryEasyPerimeter of an equilateral triangle
Geometry and Trigonometry practice question
An equilateral triangle has sides of length 7. What is its perimeter?
Answer: 21
All three sides are equal, so the perimeter is 3 × 7 = 21.
Common wrong answers
- If you answered 10
- 10 is 7 + 3, adding the number of sides instead of multiplying by it.
- If you answered 14
- 14 is 2 × 7 — a triangle has three sides.
- If you answered 49
- 49 is 7², which is neither the perimeter nor the area.
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