*Straight Lines

- Horizontal line

- Vertical line

- Broken line

- Wavy line

- Dotted line

- Zigzag line

- Diagonal line

- perpendicular line

- parallel line

*Curved Lines

- Concave line

- Convex line

- Spiral line

A line of best-fit.

If there is an actual physical line on the floor, and you are on it, then you are on line. If you are in a line of people, you are in line. If you are in a line of people, and also standing on a physical line on the floor, then you are both in and on line. If there is a group of people, standing in a line, and you are standing on top of the group of people standing in line, then you are standing on line.

A line intersect is a point on a line where another line or object crosses the line.

A straight line, a telephone line, a shipping line, a fishing line.