The angle between parallel lines is ____

Q. The angle between two parallel lines is ___.

Q. (i) If a transversal intersects two parallel lines then state the relation between alternate angles.
(ii) If each of the two parallel lines are parallel to the third line then what is the relation between them?
(iii) If a transversal intersects two parallel lines and the corresponding sides of two angles are parallel then what is the relation between these angles?
(iv) If AB is a line and P is a point outside it then how many lines can be drawn through P and Parallel to AB?
(v) If a transversal intersects two parallel lines such that the ratio between the interior angles on one of its side is 2:7, then find the measure of the greater angle.

Q.

Show that if there is a transversal between two parallel lines, the interior angle bisectors meet to form a rectangle. [4 MARKS]

Q. The sum of interior angles of a pair of parallel lines,formed by a line that intersects the parallel lines is

Q. Two parallel straight lines are inclined to the horizon at an angle $\alpha$. A particle is projected from a point mid way between them so as to graze one of the lines and strikes the other at right angle. Show that if $\theta$ is the angle between the direction of projection and either of lines, then $tan\theta =(\sqrt{2}-1)cot\alpha$.