Point:

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.

Line:

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.

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Plane:

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."

Ray:

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.

Angle:

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.