SPHERE

Grade IX

SPHERE

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Calculate the surface area of a sphere which has 21 cm of radius!

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What is the surface area of a solid hemisphere if its diameter is 8 cm?

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Look at the following figure!

Calculate the surface area of a quarter of solid sphere with diameter 20 cm!

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An outside a hemispherical roof with 7 meter in diameter will be painting. If a tin of paint can cover 11 m² then how many the number of tins are needed?

Multiple Choice

There are two spheres with diameter 3.5 cm and 7 cm. What is the ratio of area of those spheres?

• 1 : 2

• 1 : 3

• 1 : 4

• 1 : 6