Find the circumference of a circle when (a) radius = 14cm and (b) when diameter= 21cm π=22/7
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πr2. = 22÷7×14×14
=44×14
=616cm
b). 22÷7×21÷2×21÷2
= 346.5cm
=44×14
=616cm
b). 22÷7×21÷2×21÷2
= 346.5cm
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