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The x co -ordinate of the incentre of th...

The x co -ordinate of the incentre of the triangle that has the coordinates of mid - points of its sides as (0 , 1) , (1 ,1) and (1 ,0) is 'a/(2+sqrt2)'. Find a.

A

`2-sqrt2`

B

`1+sqrt2`

C

`1-sqrt2`

D

`2+sqrt2`

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The correct Answer is:
A
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