Definition: The common leg of two angles.

Usually found in triangles and other polygons, the included side is one that links two angles together. Think of it as being 'included' between two angles.

See also Included angles

- 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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