Basic Geometrical Ideas

• A point determines a location. The tip of a compass, the sharpened end of a pencil, the pointed end of a needle, etc., are the examples of points. Generally, points are denoted by capital letters.
• A line segment corresponds to the shortest distance between two points. The line segment joining the points P and Q is denoted as .

• A ray is a portion of a line, which starts at one point and goes endlessly in a direction.

This ray is denoted as . Arrow head is towards Q since it is extended along Q.

• When a line segment PQ is extended indefinitely on both sides of points P…