find the csa of 4 pillars consisting of a cylinder 7.5 m high and with 2.5 m base radius surmounted by a hemisphere ?
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Answer:
The height of pillar is 500cm
The radius of pillar is 21cm
The surface area is 2πrh
2×
7
22
×21×500
6×22×500=66000
Surface area of 4 pillars is 4×66000=264000cm
2
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