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The circle has variable radius 2x+1 cm. ...

The circle has variable radius `2x+1` cm. Find the change is area with respect to `x` when radius is `3` cm.

A

`4pi`

B

`6pi`

C

`12pi`

D

`20pi`

लिखित उत्तर

Verified by Experts

The correct Answer is:
C
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