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314/3,14 = r^2
100 = r^2
r = 10
d= 20
Keliling= 3,14 x 20 = 62,8 cm
jika luas lingkaran = 314 cm²
maka jari-jari (r) lingkaran adalah
jari-jari lingkaran = 10cm
keliling lingkaran = 2πr
= 2 x 3,14 x 10 = 62,8 cm
smoga membantu