A point shows location and has no size or dimension. A point is stood for by a dot and also is usually named with a letter of choice. In the graphics below, the points room labelled by a adjacent letter.


A line is a set of clues extends in 2 opposite directions there is no end. A line is one-dimensional and has no width. That is figured out by naming two points ~ above the heat or by writing a lowercase letter of selection after the line.

The notation, for example, abdominal muscle (written with a line symbol over the letters), is read as "line AB" and also refers come the heat that has actually points A and also B.

You are watching: Points that lie on the same line


A plane is a level surface that has no thickness and also extends without ending in all directions. That is a two-dimensional object. A airplane is represented by a parallelogram and also may be called by composing an uppercase letter of selection in one of its corners. I will go into detail about what a parallel is in future lessons. For now, think the a parallelogram as a "window pane."For simplicity, you might want to think the a airplane as one infinitely huge sheet the paper.

The diagram below shows three points, a line, and also a plane.

Line Segment:

A heat line segment is part of a line having two points, dubbed endpoints. It also has points in between the endpoints. A heat segment go not have actually a set of consistent points favor a heat does. Endpoint means that a line has actually a beginning and also an end. The notation for a line segment in a bar over any type of letter that choice. Say abdominal has a bar end it, friend would check out it together "line segment AB."


A beam is component of a line having actually one endpoint and a set of every points on one next of the endpoint. A ray is constantly named through using two letters of choice. The an initial letter have to be the endpoint. We attract an arrow with an endpoint end the letters.


An angle is the union of two rays having actually the same endpoint. The endpoint that an edge is dubbed the vertex; the rays are referred to as the sides of the angle.


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

Collinear Points: points the lie on the exact same line.

Coplanar Points: points the lie in the exact same plane.

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Opposite Rays: 2 rays that lie ~ above the same line, with a common endpoint and also no other points in common. The contrary rays type a directly line and/or a right angle that equates to 180º.