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Mathematics for IGCSE & O level - Mensuration (Section 11 - No. 30)

The surface area of a sphere is 64π cm². What is the radius of the sphere?
4 cm
8 cm
16 cm
32 cm

Vysvetlenie

SA = 4πr² --> 64π = 4πr² --> r² = 16 --> r=4 cm

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