Definition: A
line
which starts at a
point
with given
coordinates,
and goes off in a particular direction to infinity,
possibly through a second point.

Try this
Adjust the ray below by dragging an orange dot and see how the ray
AB behaves. You can also drag the origin point at (0,0).

A ray is a line that starts at a given point and goes off for ever in some direction. It may pass through another point as it does so. This is the same as the definition of a Ray in ordinary plane geometry, the only difference being that we know the coordinates of the points involved. The naming conventions are also the same.

- In the above diagram, press reset. The ray AB has an endpoint A at (53,7) and passes through point B at (53,20) on its way to infinity.
- Drag A, B or the origin point and construct various other rays to get a feel for the concept.

See also the definition of a Ray in plane geometry.

- Introduction to coordinate geometry
- The coordinate plane
- The origin of the plane
- Axis definition
- Coordinates of a point
- Distance between two points

- Introduction to Lines

in Coordinate Geometry - Line (Coordinate Geometry)
- Ray (Coordinate Geometry)
- Segment (Coordinate Geometry)
- Midpoint Theorem

- Cirumscribed rectangle (bounding box)
- Area of a triangle (formula method)
- Area of a triangle (box method)
- Centroid of a triangle
- Incenter of a triangle
- Area of a polygon
- Algorithm to find the area of a polygon
- Area of a polygon (calculator)
- Rectangle
- Square
- Trapezoid
- Parallelogram

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