Advanced MathMediumPerimeter of a field from its area and shape
Advanced Math practice question
A rectangular field is 3 times as long as it is wide, and its area is 300 square metres. What is the perimeter of the field, in metres?
Answer: 80
3w² = 300 gives w = 10, so the field is 10 by 30 and the perimeter is 80.
Common wrong answers
- If you answered 10
- 10 is the width.
- If you answered 40
- 40 halves the perimeter.
- If you answered 60
- 60 is twice the length only.
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