The radius of the circle passing through the point $(6, 2)$ and two of whose diameters are ;$\displaystyle x+y=6$ and& ;$\displaystyle x+2y=4$ is:

Equation of a circle whose centre is in $I$ quadrant as $\left(\alpha,\ \beta\right)$ and touches $x-$axis will be:

A circle has radius $3$ units and its centre lies on the line $y=x-1$. Then the equation of this circle if it passes through the point $(7, 3)$, is?

কোন শর্তে $\mathrm{an² + by² = c}$ সমীকরণটি একটি বৃত্ত নির্দেশ করে?

The line $(x-2)\cos \theta +(y-2)\sin \theta =1$ touches a circle for all value of $\theta$, then the equation of circle is