18. In figure, Name:

(i) four pairs of intersecting lines
(ii) four collinear points
(iii) three non-collinear points
(iv) lines whose point of intersection is P

19. Draw a figure to show
(a) point M lies on line PQ.
(b) Line AB and CD intersect at P.
(c) Rays PR and PQ with same starting point P
(d) Three parallel lines l, m, and p.