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Answer:
Step-by-step explanation:
Circumference is πD
a) 40π cm ≈ 125.7 cm = 1.257 m
b) 10(40π) = 1256.6 cm = 12.57 m
c) d = xdπ
d) x = 1000 m / 0.4π m/rev = 795.8 rev