Question

Find the circumference of a circle whose diameter is 21 cm.​

Answer 1

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Required answer :

If diameter is 21cm.

Then radius will be 21/2 cm.

Now,

we know that,

Circumference of a circle = 2πr

➠ 2 × 22/7 × 21/2

➠ 2 × 11 × 3

➠ 66cm² ans.

Answer 2

Answer:

GIVEN: D=21

So,. r= 21/2

therefore,

circumference of circle= 2πr

= 2×22/7×21/2

= 22×4

=66cm