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A circular paper is folded along its di...

A circular paper is folded along its diameter , then again it is folded to form a quadrant . Then it is cut as shown in the figure , after it the paper was reopened in the original circular shape . Find the ratio of the original paper to that of the remaining part ? ( The shaded portion is cut off from the quadrant . The radius of quadrant OAB is 5 cm and radius of each semicircle is 1 cm ) :

A

`25:16`

B

`25:9`

C

`20:9`

D

none of these

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The correct Answer is:
A
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