Advanced MathMediumPerimeter of a rectangle from its area
Advanced Math practice question
A rectangle's length is 3 times its width, and its area is 108 square units. What is the perimeter of the rectangle?
Answer: 48
3w² = 108 gives w = 6 and length 18, so the perimeter is 2(6 + 18) = 48.
Common wrong answers
- If you answered 6
- 6 is the width.
- If you answered 24
- 24 is the sum of the length and width.
- If you answered 36
- 36 uses a width of 6 and a length of 12.
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