A allude shows location and also has no size or dimension. A allude is represented by a dot and is usually named with a letter of choice. In the graphic below, the points are labelled through a nearby letter.


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

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

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

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

Line Segment:

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


A ray is component of a line having actually one endpoint and a set of every points ~ above one side of the endpoint. A ray is constantly named by using two letters the choice. The an initial letter should be the endpoint. We draw an arrow with one endpoint end the letters.


An edge is the union of 2 rays having the very same endpoint. The endpoint of an edge is dubbed the vertex; the beam are dubbed the political parties of the angle.


There space a few additional state in geometry that must be taken as well. They define relationships in 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 the lie top top the same line, with a typical endpoint and also no other points in common. The opposite rays kind a directly line and/or a right angle that equals 180º.