luas lingkaran = Π * r²
314 = 3,14 * r²
r² = 314 / 3,14
= 100
r = √100 = 10 cm
keliling lingkaran = Π * d
= 3,14 * 2 * 10
= 62,8 cm
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luas lingkaran = Π * r²
314 = 3,14 * r²
r² = 314 / 3,14
= 100
r = √100 = 10 cm
keliling lingkaran = Π * d
= 3,14 * 2 * 10
= 62,8 cm
3.14r² = 314 cm²
r² = 100 cm²
r = 10
πd = 3.14 × 10×2 = 62.8 cm