Question

Find the circumference of a circle of radius 10.5 cm

Answer 1

Heya...

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We Know That,

Circumference = pi *Diameter

Let, Circumference be C

Pi Be Pi

Diameter = D or 2 r (Because, Diameter = 2 x Radius)

Radius be r

Then, 

C = pi * 10.5*2

C = 22/7 * 21

c = 22 * 3 (Because, 7*3 = 21)

C = 66 cm

Hence,

Circumference = 66 cm

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Hope This Helps....

Thanks....

:-)

Answer 2

Heya ...^_^

Here's ur ans.

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Circumference of circle = 2πr

Here
r = Radius of circle = 10.5 cm

Circumference = 2× 22/7 × 10.5
= 44× 1.5
=. 66.0 cm