Draw A B ↔ and C D ↔ as two parallel lines using scale.

A line can be defined as a straight one-dimensional figure that has no thickness and extends endlessly in both directions. A straight line A B is represented by A B ↔ and has no endpoints. A line contains infinitely many points. If we draw a line which will pass through two fixed points, then we can draw only one line. Here, line A B ↔ passes through two fixed points A and B . Similarly, line C D ↔ passes through two fixed points C and D . Now, let us draw line A B ↔ . Using scale, draw another line C D ↔ at constant gap of 2 cm from line A B ↔ such that A B ↔ and C D ↔ represent parallel lines. The parallel lines A B ↔ and C D ↔ are drawn, using scale, as shown below:

Draw a ray M N → on which S is a point.

A ray can be defined as a part of a line that has a fixed starting point but no endpoint. It can extend infinitely in one direction. On its way to infinity, a ray may pass through more than one point. While naming a ray, it is denoted by drawing a small ray on top of the name of the ray. Consider ray A B → . Here, ray A B → starts from point A and and on its way to infinity, it passes through point B . Now, Ray M N → , having a point S on it, is drawn and shown below: