geometry basics

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Last updated 3:15 PM on 8/17/26
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9 Terms

1
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point

A location. It has no size and no shape.

2
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line

made up of points has no thickness

3
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line segment

A portion of a line with 2 endpoints. ⭐️- named by endpoints

4
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ray

A line that extends indefinitly on 1 end.

5
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plane

A flat surface made up of points that extends indefinitly in all directions

6
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collinear

points that lie in the same line

7
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coplanar

Points that lie on the same plane. ⭐️- has to be 4 points

8
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congruent segments

same size, same shape

segments with the same measure

9
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segment addition postulate

If A,B, and C are collinear, and B is between A and C AB (line over it) + BC 9line over it) = AC (line over it)