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113,04=3,14*r'2
r'2=113,04/3,14
r'2=36
r=6=jarijari
K=2*phi*r
k=2*3,14*6
K=37,68 cm
113,04 = 3,14 × r^2
r^2 = 113,04 / 3,14
r^2 = 36
r = 6
keliling lingkaran = \2 pi r\
= 2 × 3,14 × 6
= 37,68 cm