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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
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
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