The coordinates of the feet of the perpendiculars from the vertices of a triangle to the opposite sides are $(20, 25)$,$(8, 16)$,and $(8, 9)$. The orthocentre of the triangle lies at the point-

The point $P(a, b)$ undergoes the following three transformations successively:
$(a)$ reflection about the line $y=x$.
$(b)$ translation through $2$ units along the positive direction of $x$-axis.
$(c)$ rotation through angle $\frac{\pi}{4}$ about the origin in the anti-clockwise direction.
If the coordinates of the final position of the point $P$ are $\left(-\frac{1}{\sqrt{2}}, \frac{7}{\sqrt{2}}\right)$,then the value of $2a+b$ is equal to:

The point $(3,2)$ undergoes the following three transformations in the order given:
$(i)$ Reflection about the line $y=x$.
(ii) Translation by the distance $1$ unit in the positive direction of $x$-axis.
(iii) Rotation by an angle $\frac{\pi}{4}$ about the origin in the anti-clockwise direction.
Then,the final position of the point is:

The point $(4, 1)$ undergoes the following two successive transformations:
$(i)$ Reflection about the line $y = x$
$(ii)$ Translation through a distance $2$ units along the positive $x$-axis
Then the final coordinates of the point are

The point $(4, 1)$ undergoes the following three transformations:
$(i)$ Reflection about the line $y = x$.
$(ii)$ Translation by $2$ units along the positive direction of the $x$-axis.
$(iii)$ Rotation about the origin by an angle of $\pi/4$ in the counter-clockwise direction.
Find the coordinates of the final position of the point.