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Find the equation of the circle whose ra...

Find the equation of the circle whose radius is `5 and` which touches the circle `x^2+y^2-2x-4y-20=0` externally at the point `(5,5)dot`

A

`x^2+y^2-18x-16y-120=0`

B

`x^2+y^2-18x-16y+120=0`

C

`x^2+y^2+18x+16y-120=0`

D

`x^2+y^2+18x-16y+120=0`

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