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132 = 2 x 3,14 x r
132 = 6,28 r
r = 132/62,8
r = 21,01 cm
Jadi, jari jarinya adalah 21,01 cm
2. 3, 14 .r = 132
r = 132/2 × 3,14
= 132/6,28
= 21, 01 cm