Definition: The point where two lines meet or cross

Try this Drag any orange dot at the points A,B,P or Q.
The line segments intersect at point K.

An intersection is a single point where two lines meet or cross each other. In the figure above we would say that "point K is the intersection of line segments PQ and AB". Another way it may be said is that "the line segment PQ intersects AB at point K".

Note that two *line segments* need not necessarily intersect anywhere. In the figure above, adjust point B upwards
until the two line segments no longer intersect. However, recall that *lines* (as opposed to line segments) go on
forever in both directions, and so they
will always intersect somewhere unless they are exactly parallel.

- 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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