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# Basic Tools/Geometry

### Geometry Basics

TermDefinition
Naming a line You can name a line with any two points on it. This can be read in either order. The symbol over the letters is a two- sided arrow.
line Segment The area on a line between any two of its points.
Point Has no size. Represented by a small dot. Named by a capital letter.
Line A series of points that extend in two opposite directions without end.
Naming a line segment The letter s of the two points that that make up the endpoints of the segment. The symbol over the letters in the line without any
Ray A line that has a endpoint and extends without end in the other direction.
Plane A flat surface that has no thickness. Contains many lines and extends without end in the direction of those lines.
Coplanar Points or lines that exist in the same plane.
Naming a plane Either with one capital letter not representing a point or with 3 or 4 points residing on the corners of the plane.
Naming a Ray Two letters on the ray, starting with the endpoint and including any other point on the line. A one sided arrow over the two letters with the non arrow on the same as the endpoint.
Opposite Rays Two rays extending in opposite directions that share a common end point
Naming a point A capitol letter, typically above the dot representing the point.
Mid point A point that divides the segment into two congruent segments. A midponit, or any line, ray, or other segment, is said to bisect the segment.
Created by: blackie12

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