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314 = 3,14 × d
d = 100 cm
r = 100/2 = 50 cm
L = πr²
L = 3,14 × 50²
L = 3,14 × 2500
L = 7850 cm²
π × d = 314 cm
3,14 × d = 314 cm
d = 314/3,14
d = 100 cm
jika d = 100 cm, maka r = 50 cm
luas lingkaran
= π × r²
= 3,14 × 50²
= 3,14 × 2.500 cm²
= 7.850 cm²