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x² = 125/3,14
x² = 39,8
x = 6,3 cm
Kelilingnya:
Diameter= 6,3 x 2 = 12,6
3,14x 12,6
= 39,564 cm
125 = 3,14 x
=
= 39,81
r =
= 6,3 cm
K lingkaran = 2 π r
= 2 x 3,14 x 6,3
= 39,6 cm