Geometry Vocab

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Last updated 9:24 PM on 9/7/26
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21 Terms

1
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Point

a representation of a location that has no size and is marked with a circle and a capital letter.

<p>a representation of a location that has no size and is marked with a circle and a capital letter.</p>
2
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Segment

a part of a line consisting of two endpoints and all the points in between them.

<p>a part of a line consisting of two endpoints and all the points in between them.</p>
3
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Line

A series of points that extend in two opposite directions without end. Symbolically a line is represented by the two points making the line with a line above them.

<p>A series of points that extend in two opposite directions without end. Symbolically a line is represented by the two points making the line with a line above them.</p>
4
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Collinear points

points that lie on the same line

<p>points that lie on the same line</p>
5
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Parallel lines

Coplanar lines that do not intersect. Parallel lines create a plane.

<p>Coplanar lines that do not intersect. Parallel lines create a plane.</p>
6
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Plane

A flat surface that has no thickness. Any 3 non-collinear points can make a plane.

<p>A flat surface that has no thickness. Any 3 non-collinear points can make a plane.</p>
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Coplanar

Points and lines that lie on the same plane.

<p>Points and lines that lie on the same plane.</p>
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Parallel planes

planes that do not intersect. A line and a plane that do not intersect are also parallel.

<p>planes that do not intersect. A line and a plane that do not intersect are also parallel.</p>
9
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Skew lines

non-coplanar lines; therefore, they are not parallel and do not intersect.

<p>non-coplanar lines; therefore, they are not parallel and do not intersect.</p>
10
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Ray

a part of a line where one side contains an endpoint. When writing the symbol of the ray, the endpoint is placed first.

<p>a part of a line where one side contains an endpoint. When writing the symbol of the ray, the endpoint is placed first.</p>
11
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Opposite Rays

two collinear rays with the same endpoint. Opposite rays always form a line.

<p>two collinear rays with the same endpoint. Opposite rays always form a line.</p>
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Angles

formed by two rays with the same endpoint. The rays are the legs of the angle. The endpoints are the vertex of the angle.

<p>formed by two rays with the same endpoint. The rays are the legs of the angle. The endpoints are the vertex of the angle.</p>
13
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Linear pair

two adjacent angles that create a straight line.

<p>two adjacent angles that create a straight line.</p>
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Perpendicular Lines

two lines that intersect that for 90 degree angles.

<p>two lines that intersect that for 90 degree angles.</p>
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Obtuse angle

an angle greater than 90 degrees but less than 180 degrees.

<p>an angle greater than 90 degrees but less than 180 degrees.</p>
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acute angle

an angle greater than 0 degrees but less than 90.

<p>an angle greater than 0 degrees but less than 90.</p>
17
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Straight angle

an angle that equals 180 degrees. A straight angle is the same as a line.

<p>an angle that equals 180 degrees. A straight angle is the same as a line.</p>
18
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Right angle

an angle that equals 90 degrees

<p>an angle that equals 90 degrees</p>
19
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Vertical angles

angles that are made by two intersecting lines. Opposite angles are congruent and adjacent angles are supplementary.

<p>angles that are made by two intersecting lines. Opposite angles are congruent and adjacent angles are supplementary.</p>
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Supplementary angles

two angles whose sum is 180 degrees

<p>two angles whose sum is 180 degrees</p>
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Complimentary angles

two angles whose sum is 90 degrees

<p>two angles whose sum is 90 degrees</p>