Find the circumference of a circle whose diameter is:
(i) 28 cm
(ii) 70 cm
(iii) 42 cm
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Answer:
c= 2πr
r=d/2
=28/2 =14
(i) 2×22/7×14
=2×22×2
=88
(ii) r=35
= 2×22/7×35
=2×22×5
=220
(iii) r= 21
=2×22/7×21
=2×22×3
=132
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