Usually found in triangles and other polygons , two of the sides that meet at a vertex of the polygon are called adjacent sides.

- Point definition
- Line definition
- Vertical lines
- Horizontal lines
- Line segment
- Midpoint of a line
- Ray
- Angle
- Opposite rays
- Intersection
- Parallel lines
- Transversal
- Line bisector
- Perpendicular bisector
- Coplanar
- Collinear points
- Plane

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