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In the given figure, M is the mid point ...

In the given figure, M is the mid point of line segment AB whose length is 2a. Semicircles having diameters AM, MB and AB are drawn at the same side of the line. The radius of a circle toughing all the three semicircle is

A

`(2a)/3`

B

`a/2`

C

`a/3`

D

`a/4`

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The correct Answer is:
C
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