please do all three
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1)r = 3.8
diameter = 2r = 2×3.8 = 7.6
2) diameter= 9.2
R = d/2 = 9.2/2
= 4.6cm
3)r = 6.3
circumference = 2πr
= 2 × 22/7×6.3
= 44×0.9 = 39.6cm
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