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The equation of circle which touches x a...

The equation of circle which touches x axis at origin and radius is r units is

A

a)`x^2+y^2=2rx`

B

b)`x^2+y^2=2ry`

C

c)`x^2+y^2+2rx=0`

D

d)`x^2+y^2+2ry=0`

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