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r = 30 cm
berputr sebnyak 100 kli
mka :
K = 2 x π x r
= 2 x 3,14 x 30
= 188,4 cm
jdi jrk y ditempuh = 188,4 x 100 = 18.840 cm = 188,4 m
= 30 x 100
= 3000