The surface area of a solid sphere is 120 square centimetres. If it is

1.	The surface area of a solid sphere is 120 square centimetres. If it is cut into two halves, what would be the surface area 0f each hemisphere?
Answer» Surface area of the solid sphere = \(4\pi r^2\) \(4\pi r^2=120\) \(r^2=\frac{120}{4\pi}=\frac{30}{\pi}\) Surface area of one hemisphere = 3πr² 3πr² = 3 π × \(\frac{30}{\pi}\) = 90 cm²

The surface area of a solid sphere is 120 square centimetres. If it is cut into two halves, what would be the surface area 0f each hemisphere?

Answer»

Surface area of the solid sphere = \(4\pi r^2\)

\(4\pi r^2=120\)

\(r^2=\frac{120}{4\pi}=\frac{30}{\pi}\)

Surface area of one hemisphere = 3πr²

3πr² = 3 π × \(\frac{30}{\pi}\) = 90 cm²

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The surface area of a solid sphere is 120 square centimetres. If it is cut into two halves, what would be the surface area 0f each hemisphere?

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