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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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