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Verified answer
10). luas 1/2 lingkaran = 1/2πr²157 = 1/2X3,14Xr²
157 = 1,57Xr²
157/1,57 = r²
100 = r²
√100 = r
10 = r
maka, panjang jari2nya adl 10 cm
maaf kalau salah