Point:

A point shows location and has no dimension or dimension. A point is represented by a dot and is usually called with a letter the choice. In the graphic below, the points space labelled by a nearby letter.

Line:

A line is a collection of point out extends in 2 opposite directions there is no end. A line is one-dimensional and has no width. The is established by naming 2 points on the heat or by creating a lowercase letter of an option after the line.

The notation, because that example, ab (written v a heat symbol end the letters), is read as "line AB" and refers to the line that has actually points A and also B.

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Plane:

A aircraft is a level surface that has actually no thickness and extends without ending in all directions. That is a two-dimensional object. A airplane is represented by a parallelogram and also may be named by composing an uppercase letter of an option in among its corners. I will enter detail about what a parallel is in future lessons. For now, think of a parallel as a "window pane."For simplicity, you might want come think of a aircraft as an infinitely big sheet of paper.

The diagram below shows 3 points, a line, and a plane.

Line Segment:

A line line segment is component of a line having two points, dubbed endpoints. It also has points between the endpoints. A heat segment walk not have actually a set of constant points like a heat does. Endpoint way that a line has actually a beginning and also an end. The notation because that a line segment in a bar over any kind of letter of choice. Say ab has a bar over it, you would read it as "line segment AB."

Ray:

A beam is component of a line having actually one endpoint and also a collection of every points on one next of the endpoint. A beam is constantly named by using 2 letters of choice. The first letter have to be the endpoint. We attract an arrow with an endpoint end the letters.

Angle:

An angle is the union of 2 rays having actually the exact same endpoint. The endpoint the an angle is called the vertex; the beam are referred to as the sides of the angle.

There space a couple of additional state in geometry that must be construed as well. They define relationships between geometric objects:

Collinear Points: points the lie top top the very same line.

Coplanar Points: points the lie in the same plane.

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Opposite Rays: 2 rays the lie top top the exact same line, with a typical endpoint and also no other points in common. Opposite rays kind a directly line and/or a straight angle that amounts to 180º.