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Circles: circumference and area
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Learn it Circumference $C = 2\pi r = \pi d$. Area $A = \pi r^2$. Use the radius (half the diameter) in the area formula.
Example: A circle has diameter 12 cm. Find C and A (π ≈ 3.14).
- $r = 6$.
- $C = 2 \times 3.14 \times 6 = 37.68$ cm.
- $A = 3.14 \times 36 = 113.04$ cm².
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