if the curved surface area of a cylinder is 1320 cm square and its base radius is 21 cm then its total surface area is
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curved surface area of cylinder = 2πrh
1320 cm = 2×22/7×21×h
1320 cm = 2×22×3×h
1320 cm. = 132×h
1320cm/132 = h
h. = 10 cm
total surface area of cylinder. = 2πr(r+h)
= 2×22/7×21(21+10)
= 2×22/7×651
= 2×22×93
= 4092 cm^2
hope it's helpful...........
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