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Step-by-step explanation:
n = 750 complete revolution
l = 1m
d = 84 /100
r = 42/100
area = 2pieRh = 2 x 22/7 x 42 / 100 x 1
area = 2.6 m square
area coveted in complete 750 revolution
= 2.6 x 750 = 1950 m2
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