Trace the edges of the following objects and say what type of lines you have got.

a. Horizontal edge of a pencil box

b. Broken piece of a bangle

C. Surface of a loose thread

d. Vertical edge of a notebook

e. Both edges of a ruler

f. Unsharp edges of a pair of scissors

g. Long edge of a set square

The number of points on a line segment is finite. 

In the figure, do the segments $AB$ and $CD$ intersect? Are they parallel? Give reasons for your answer.

The length of a line is measurable.

In the figure of a table, name the pairs of parallel edges of the top.

Take any points $A, B, C, D and E$ in such a way that no three points are collinear.

Join them in pairs and answer the following:

How many of the points pass through $D$ if the lines can be drawn joining two points at a time? 

Using a set square and a ruler, test whether $l\parallel m$.

What do you mean by collinear points? How many lines can you draw passing through three collinear points?

In the given figure name four pairs of intersecting lines.

Identify parallel line segments in the figure.

Infinite number of lines can pass through two given points.

The number of ray(s) starting from one given point and passing through another fixed point is:

Name the groups of all possible parallel edges of the box whose figure is shown below.

A ray has definite length.

Mark three non-collinear points $\mathrm{A}, \mathrm{B}, \mathrm{C}$ as shown. Draw lines through these points taking two at a time. Name the lines. How many such different lines can be drawn?