Geometry Vocabulary

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Last updated 11:55 AM on 9/10/26
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16 Terms

1
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point

a position in space, having to size; it is represented with a dot.

<p>a position in space, having to size; it is represented with a dot.</p>
2
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line

a set of points in one dimension that go forever in both directions.

<p>a set of points in one dimension that go forever in both directions.</p>
3
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ray

a line in one direction; there a starting point, and it goes forever

<p>a line in one direction; there a starting point, and it goes forever</p>
4
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segment

a chunk of a line.

<p>a chunk of a line.</p>
5
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plane

a flat 2 dimensional surface.

<p>a flat 2 dimensional surface.</p>
6
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vertex

the point where two or more rays intersector meet, forming an angle.

<p>the point where two or more rays intersector meet, forming an angle. </p>
7
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acute angle

angle less than 90 degrees.

<p>angle less than 90 degrees. </p>
8
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obtuse angle

angle greater than 90 degrees.

<p>angle greater than 90 degrees.</p>
9
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right angle

an angle that measures exactly 90 degrees.

<p>an angle that measures exactly 90 degrees. </p>
10
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intersection (noun) or intersect (verb)

the point where two or more lines meet or cross.

<p>the point where two or more lines meet or cross. </p>
11
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straight angle

an angle that measures exactly 180 degrees.

<p>an angle that measures exactly 180 degrees. </p>
12
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number of degrees in a circle

A full circle measures exactly 360 degrees.

<p>A full circle measures exactly 360 degrees. </p>
13
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adjacent

next to

14
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complementary angle

two angles that add up to 90 degrees.

<p>two angles that add up to 90 degrees. </p>
15
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supplementary angle

two angles that add up to 180 degrees.

<p>two angles that add up to 180 degrees. </p>
16
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