An angle whose measure is $90^{\circ}$ is called a $\ldots \ldots \ldots$

Two lines are respectively perpendicular to two parallel lines. Show that they are parallel to each other.

Find the measure of an angle,which is one-eighth of the measure of its supplementary angle. (in $^o$)

Two adjacent angles are equal. Is it necessary that each of these angles will be a right angle? Justify your answer.

Find the measure of the complementary angle of an angle of $44^{\circ}$. (in $^{\circ}$)

If the measure of an acute angle is $x^{\circ}$,find the difference of the measure of its supplementary angle and complementary angle. (in $^{\circ}$)