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3140= 3.14 ×d
3140/3.14=d
d=1.000
r=d/2=1.000/2= 500cm
3140= π × d
3140= 3,14 × d
d= 3140 / 3,14
d= 1.000
karena :
r= 1/2 d
maka :
r= 1/2 × 1.000
r= 500
Jadi, panjang jari-jari ligkaran adalah 500 cm.