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 Class 7 Mathematics Length, Perimeter and Area: Surface Area

The area of a curved surface of a cylinder is 1320#cm^2#. The height of the cylinder is 10cm. What is the radius of the cylinder in centimeters?
(Take #pi=22/7#)
A. 21
B. 42
C. 84
D. 132

 (3m 51s)
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