#GEOMETRY DEFINITION OF RAY MOVIE#

Lasers are excellent examples of rays because unlike sports balls, they are not much affected by earth's gravity, so they shine in steady, straight one-way lines from their source. The path an arrow travels from a bow is a ray and has the added benefit of being, well, arrow-shaped.

#GEOMETRY DEFINITION OF RAY MOVIE#

The light beam from a classroom LCD projector is a ray so is light from a movie projector at your local cinema. Tennis pro, Rafael Nadal, famously serves tennis balls at some 217 kph (135 mph), which defies gravity's tug so well it seems to travel in a straight line, just like a ray. It originates at our star, the Sun, and travels one way, striking earth some eight minutes after it left its 'endpoint,' the Sun. Ray in geometry examplesĪ ray of sunshine is a ray. He is the endpoint the traveling football is the one-way line.

Gravity tugs the football down, but the quarterbacks' arm speed and strength can make short passes look like straight-line rays. Parallel Lines: two coplanar lines that do not intersect.This is the symbol for Ray , named after an NFL quarterback, who can throw a football that very nearly moves like a ray. Opposite rays form a straight line and/or a straight angle that equals 180º. Opposite Rays: 2 rays that lie on the same line, with a common endpoint and no other points in common. They define relationships between geometric objects:Ĭollinear Points: points that lie on the same line.Ĭoplanar Points: points that lie in the same plane. There are a few additional terms in geometry that need to be understood as well. The endpoint of an angle is called the vertex the rays are called the sides of the angle. Angle:Īn angle is the union of two rays having the same endpoint. We draw an arrow with an endpoint over the letters. A ray is always named by using two letters of choice. Say AB has a bar over it, you would read it as 'line segment AB.' Ray:Ī ray is part of a line having one endpoint and a set of all points on one side of the endpoint. The notation for a line segment in a bar over any letter of choice. Endpoint means that a line has a beginning and an end. A line segment does not have a set of CONTINUOUS points like a line does. It also has points between the endpoints. Line Segment:Ī line line segment is part of a line having two points, called endpoints. The diagram below shows three points, a line, and a plane. For now, think of a parallelogram as a 'window pane.'For simplicity, you might want to think of a plane as an infinitely large sheet of paper. I will go into detail about what a parallelogram is in future lessons. A plane is represented by a parallelogram and may be named by writing an uppercase letter of choice in one of its corners.

Plane:Ī plane is a flat surface that has no thickness and extends without ending in ALL directions. The notation, for example, AB (written with a line symbol over the letters), is read as 'line AB' and refers to the line that has points A and B. It is identified by naming two points on the line or by writing a lowercase letter of choice after the line. A line is one-dimensional and has no width. Line:Ī line is a set of points extends in two opposite directions without end. In the graphic below, the points are labelled by a nearby letter.

A point is represented by a dot and is usually named with a letter of choice. A point shows location and has no size or dimension.

Geometry definition of ray