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Write the equation of the unit circle co...

Write the equation of the unit circle concentric with `x^2+y^2-8x+4y-8=0.`

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`x^2+y^2-8x+4y-8=0`
Centre in `(4,-2)`
radius is `1`
equation =`(x-4)^2+(y+2)^2=(1)^2`
...
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RD SHARMA-THE CIRCLE-Solved Examples And Exercises
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  17. If the circles y^2=a\ a n d\ x^2+y^2-6x-8y+9=0 touch externally then a...

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  18. If (x ,3)a n d\ (3,5) are the extremities of a diameter of a circle wi...

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