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220=22/7×d
220÷22/7=d
220×7/22=d
d=70
r=1/2d
=1/2×70
=35
⇒ 2πr = 220
⇒ πr = 110
⇒ 22/7 · r = 110
⇒ r = 7/22 · 110
⇒ r = 35 cm
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