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176 = 22/7 × d
d = 7/22 × 176
d = 56 cm.
r = d : 2
= 56 : 2
= 28 cm.
176cm = 2 . 22/7 . r
2r = 176 x 7/22
2r = 56
r = 56 / 2 = 28cm
d = 2r
d = 56cm