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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 = 21 cm
Jadi jari-jarinya adalah 21 cm
132= 22/7 x diameter
diameter=132 x 7/22
diameter= 42
2 x jari jari= diameter
2 x jari jari= 132
jari jari= 42 : 2
=21 cm