Intersecting Lines

Intersecting lines are two or more lines that cross over each other at some point. When two lines intersect, they form angles. The point where the lines intersect is called the point of intersection. Intersecting lines are commonly seen in geometry and are an essential part of understanding shapes and angles.

Examples of intersecting lines:

- The lines on a graph intersect at the origin.
- The cross in the center of a tic-tac-toe board is where the lines intersect.
- The lines on a road can intersect at a traffic light or intersection.

Parallel Lines

Parallel lines are two or more lines that never intersect. They are always the same distance apart and have the same slope. Parallel lines can be found in many different contexts, such as in geometry, architecture, and engineering.

Examples of parallel lines:

- The lines on a railroad track are parallel.
- The lines on a sheet of notebook paper are parallel.
- The lines on a basketball court are parallel.

Coplanar Lines

Coplanar lines are lines that exist within the same plane. A plane is a flat surface that extends infinitely in all directions. Coplanar lines can intersect, be parallel, or be skew (not intersecting and not parallel).

Examples of coplanar lines:

- The lines on a sheet of graph paper are coplanar.
- The edges of a rectangular prism are coplanar.
- The lines on a map are coplanar.

Concurrent Lines

Concurrent lines are three or more lines that intersect at a single point. This point is called the point of concurrency. Concurrent lines are commonly seen in geometry and are important in understanding shapes and angles.

Examples of concurrent lines:

- The altitudes of a triangle intersect at a single point called the orthocenter.
- The angle bisectors of a triangle intersect at a single point called the incenter.
- The perpendicular bisectors of the sides of a triangle intersect at a single point called the circumcenter.

Because (×) has -
point=1
lines=2
and it can be intersecting lines