The end points of the diameter of a circle are $(2, 4)$ and $(2, 6)$. The radius of the circle is:

Find the coordinates of the point on the $X-$axis which is at a distance of $5$ units from $A(4,4)$.

If the midpoints of the sides $\overline{AB}$,$\overline{BC}$,and $\overline{CA}$ in $\Delta ABC$ are respectively $D(1, 2)$,$E(2, 1)$,and $F(3, 3)$,then find the centroid of $\Delta ABC$.

The coordinates of the midpoint of a line segment joining $A (3, -2)$ and $B (-1, 4)$ are:

Find the distance between the points $A(5, 8)$ and $B(1, 2)$.

If $A(-1, 4), B(2, 3)$ and $C(8, 1)$,then which of the following is true regarding the collinearity of points $A, B,$ and $C$?