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254, 34 = 3,14 x r²
<=> r² = 254,34/3,14
<=> r² = 81
<=> r = √81
<=> r = 9
Jadi, jari-jarinya adalah 9 cm
3,14 x r² = 254,34
r² = 254,34/3,14
r² = 81
r = √81
r = 9