Grade 7 · Math
Find a circle’s exact circumference
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A circle has radius 5 cm. What is its exact circumference?
- 20π cm
- 10 cm
- 10π cm
- 5π cm
See the answer & why
10π cm
The diameter is 2 × 5 = 10 cm. Circumference is π times diameter, so C = 10π cm.
A little hint: Circumference is the boundary length. Use C = 2πr and keep π for an exact answer.
Identify the radius, which runs from the center to the circle.
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