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K = 132 cm
Maka,
K = 2 x x r
132 = 2 x 22/7 x r
132 = 44/7 x r
r = 132 : 44/7
r = 132 x 7/44
r = 924/44
r = 21 cm
Jadi, jari-jarinya adalah 21 cm
132 = 2πr
132:2 = πr
66 = πr
r = 66x7/22
r = 3x7
r= 21