Geometry and TrigonometryEasyArea from a diameter as a multiple of pi
Geometry and Trigonometry practice question
A circular table top has a diameter of 10 inches. Its area is kπ square inches. What is the value of k?
Answer: 25
The radius is 5, so the area is π(5)² = 25π.
Common wrong answers
- If you answered 10
- 10 is the diameter.
- If you answered 20
- 20 is 2 × 10, mixing up circumference with area.
- If you answered 100
- 100 uses the diameter instead of the radius.
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