Geometry and TrigonometryEasyFormula for area
Geometry and Trigonometry practice question
A circle has a radius of 3 centimetres. Which expression gives its area, in square centimetres?
- A. 9πCorrect
- B. 6π
- C. 3π
- D. 9
Answer: A. 9π
Area = πr² = π(3²) = 9π.
Why the other answers are wrong
- B. 6π
- 6π is the circumference.
- C. 3π
- 3π forgets to square the radius.
- D. 9
- The factor π is missing.
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