Three consecutive vertices of a parallelogram $ABCD$ are $A(3, -2), B(4, 0), C(6, -3)$. The $4^{th}$ vertex, $D$ is.

The ratio in which the line segment joining the points $P(4, 5)$ and $Q(-10, -2)$ is divided by the $x-$axis is.

The vertices of $∆\mathrm{ABC}$, are $A(0, 6), B(8, 12)$ and $C(8, 0)$. The coordinates of its incentre are.

A circle passes through the points $A(2, -9), B(5, -8)$ and $C(2,1)$. The centre of the circle is.