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Find the equation of the circle which to...

Find the equation of the circle which touches the x-axis and passes through the two points(1, -2) and (3, -4).

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For the circle `x^2+y^2+2gx+2fy+c=0`
w know that,`r=sqrt(g^2+f^2−c)`
​ ⇒`g^2=c` And point (1,−2),(3,−4) are on the circle
...
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  18. If the equations of the two diameters of a circle are x-y=5\ and \ 2x+...

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