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Answer:
330cm²
Step-by-step explanation:
CSA of a cylinder = 2πrh
(r = d/2 = 21/2 = 10.5 cm)
Putting the values of 2πrh;
2 x 22/7 x 10.5 x 5
2 x 22 x 1.5 x 5 *(10.5/7 = 1.5)
330 cm²