Definitions [9]
Point: A point is a mark of position. It has neither length, width, nor thickness and occupies no space. It is usually denoted by a capital letter.
Three or more points that all lie on the same straight line
Three or more points that do not lie on the same straight line.
A line is a straight path that extends infinitely in both directions and has only length, without width or thickness.
When two or more lines pass through the same point, they are called concurrent lines. The common point through which they pass is called the point of concurrence, i.e., point O.
A line segment is part of a line between two endpoints. A line segment AB is generally denoted by the symbol `bar"AB"`.
A ray is a portion of a line that begins at a fixed point, called its origin, and extends infinitely in one direction.
Complementary angles: When the sum of the measures of two angles is 90°, the angles are called complementary angles. Example, 30° + 60° = 90°.
Supplementary angles: When the sum of the measures of two angles is 180° are called supplementary angles. Example, 60° + 120° = 180°.
