The radius of a hollow sphere is 21 cm. It is cut into two equal halves by a plane passing through its center

The radius of a hollow sphere is 21 cm. It is cut into two equal halves by a plane passing through its center

The radius of a hollow sphere is 21 cm. It is cut into two equal halves by a plane passing through its center. What is 75% of the curved surface area of the hemisphere?

a) 2090

b) 2080

c) 2070

d) 2060

quantitative aptitude
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