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Mathematics for IGCSE & O level - Mensuration (Section 12 - No. 38)

What is the area of a circle with a diameter of 10 cm?
31.4 cm²
78.5 cm²
15.7 cm²
100 cm²

解释

Area = πr², r= 5 cm, Area = π * 5²=78.5 cm²

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