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kell = 2πr
88 = 2.22/7.r
7 × 88 : 44 = r
7 × 2 = r
r = 14 cm
**maaf kalau salah
88 = 22/7 × d
88 × 7/22 = d
4 × 7 = d
28 = d
r = d : 2
= 28 cm : 2
= 14 cm