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L = 1.256 cm
maka :
L = π x r²
1.256 = 3,14 x r²
r² = 1256/3,14
r = √400
r = 20 cm
1256 = 3,14 x r²
1256/3,14 = r²
400 = r²
√400 = r
20 = r
jadi jari-jarinya adalah 20 cm