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157 = 1/2 x 3,14 x r²
157 = 1,57 r²
r² = 157 : 1,57
r² = 100
r =√ 100
r = 10 cm
L=½ πr²
2L=πr²
r²=2L÷π
r²=2x157 ÷3,14
r²=314÷3,14
r²=100
r=√100
r=10 cm