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b. 2×phi×r= 2×22/7×21=132
c. 2×phi×r= 2×3.14×5=31.4
d. 2×phi×r= 2×3.14×12=75.36
b. 2×22/7×21=132
c. 2×3,14×5=31.4
d. 2×3,14×12=75.36
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