Geometry and TrigonometryEasy–MediumPerimeter from an area and a length
Geometry and Trigonometry practice question
A rectangle has an area of 54 square units and a length of 9 units. What is its perimeter, in units?
Answer: 30
The width is 54/9 = 6, so the perimeter is 2(9 + 6) = 30.
Common wrong answers
- If you answered 15
- 15 adds the length and width without doubling.
- If you answered 24
- 24 uses a width of 3.
- If you answered 63
- 63 adds the area and the length.
More Geometry and Trigonometry questions
- Easy–Medium
A circle has a radius of 6. What is its area? (Use A = πr².) - Easy–Medium
A right triangle has legs of length 6 and 8. What is the length of the hypotenuse? - Easy–Medium
A circle has a radius of 5. What is its circumference? (Use C = 2πr.) - Easy–Medium
What is the midpoint of the segment joining the points (2, 3) and (8, 11)? - Easy–Medium
What is the measure, in degrees, of angle B? - Easy–Medium
What is the area, in square centimeters, of the trapezoid?
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