the radius of the base of cylinder is 20 cm and it's height is 13 cm.Find curved surface area
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C.s.a of a cylinder is
2πrh
Radius=r=20
Height=13
2×22/7×20×13
2×22/7×260
22/7×520
11440/7
1634.28...cm^2 is the c.s.a
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