Question

What is the circumference of a circle of diameter 21

Answer 1

Step-by-step explanation:

Firstly,we have to find it's radius.

Radius =d/2

=21/2

Circumference=2πr

=2×22/7×21/2

=22×3

=66

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Answer 2

Answer:

r=21/2

circumference =2×22/7×21/2

=22×3

=66

circumference =66