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The equation of the circle which touches...

The equation of the circle which touches both the axes and whose radius is a, is

A

`x^(2) + y^(2)- 2ax- 2ay +a^(2)=0`

B

`x^(2) +y^(2) + ax+ ay- a^(2) = 0`

C

`x^(2)+ y^(2) + 2ax + 2ay - a^(2)= 0`

D

`x^(2) + y^(2) - ax - ay + a^(2) = 0`

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The correct Answer is:
A
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