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r² = 616 : 22/7
r = √196
r = 14 cm
kel = 2x 22/7 x 14 = 88 cm
616 ⇆ 22/7 r^2
616 x 7 ⇆ 22 r^2
4312 ⇆ 22 r^2
r^2 ⇆ 4312/22
r^2 ⇆ 196
r ⇆
r ⇆ 14
K ⇆ 2 π r
⇆ 2 22/7 14
⇆ 2 x 22 x 2
⇆ 88 cm