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Find the equation of the circle passing ...

Find the equation of the circle passing through (0, 0) and making intercepts a and b on the coordinate axes.

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Let the equation of the circle be `(x-h)^2+(y-k)^2=r^2`......(1)
As center is passing through `(0,0)`
`:. (0-h)^2+(0-k)^2=r^2`
=>`h^2+k^2=r^2`......(2)
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