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44 = 22/7 x d
d = 44 : 22/7
d = 44 x 7/22
d = 14 cm
2) K = π x d
= 22/7 x 11,2 cm
= 35,2 cm
3) K = π x d
= 22/7 x 63 cm
= 198 cm
jarak 9,9 m = 990 cm
banyak putaran = 990 cm : 198 cm
= 5 putaran
4) L = π x r²
= π x 9 cm x 9 cm
= 81 π