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Paha777 [63]
3 years ago
15

4.

Mathematics
1 answer:
Helga [31]3 years ago
7 0
Well, circumference formula is pi times diameter.
C= \pi d
So, all you have to do is multiply the given diameter by pi to get your circumference in centimeters.
21·3.14=65.94

Circumference is 65.94 centimeters

65.94cm
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