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Mathematics for IGCSE & O level - Mensuration (Section 7 - No. 45)

The surface area of a hemisphere has an area of 9π cm². Calculate the curved surface area.
9π cm²
6π cm²
18π cm²
4.5π cm²

解释

Surface area = 3πr²= 9π. Therefore 2πr² = 6π cm²

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