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Mathematics for IGCSE & O level - Mensuration (Section 7 - No. 19)

If the radius of a circle is 7cm, what is its approximate circumference?
44 cm
154 cm
14 cm
22 cm

설명

C = 2πr, C ≈ 2 * 3.14 * 7 ≈ 44 cm

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