50 circular plates each of diameter 14cm and thickness 0 5cm are placed one above the other to form ...........

Quantitative Aptitude ( CCS) Mensuration 3D

50 circular plates each of diameter 14cm and thickness 0.5cm are placed one above the other to form right circular cylinder. Find its total surface area

1408 cm²

1458 cm²

1258 cm²

1236 cm²

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Explanation:

Given that the 50 circular plates each with diameter 14 cm
Radius of circular plates =7 cm
Thickness of plates =0.5 cm
Since these plates are one above the other so total thickness of plates =0.5 *100 =25cm
Total surface area of a cylinder = 2∏r×h+2∏r²
2∏r(h+r)
2×22/7×7(25+7)
Total surface area =1408 cm²
The total surface area of the cylinder is 1408 cm²