### Lines

A line is a straight path that extends infinitely in both directions. It is one-dimensional and has no thickness.

Lines are fundamental elements in geometry and serve as the foundation for various geometric concepts.

### Types of Lines:

**Straight Line (or Line Segment):**A straight path that extends infinitely in both directions. A line segment is a finite portion of a straight line.**Ray:**A part of a line that has one endpoint and extends infinitely in one direction.**Parallel Lines:**Lines that are always the same distance apart and will never intersect.**Perpendicular Lines:**Lines that intersect at a right angle (90 degrees).

## Angles:

An angle is formed by two rays or line segments that share a common endpoint. The common endpoint is called the vertex, and the rays are the sides of the angle.

### Types of Angles:

**Acute Angle:**An angle measuring less than 90 degrees.**Right Angle:**An angle measuring exactly 90 degrees.**Obtuse Angle:**An angle measuring more than 90 degrees but less than 180 degrees.**Straight Angle:**An angle measuring exactly 180 degrees.**Reflex Angle:**An angle measuring more than 180 degrees but less than 360 degrees.