Unit 1: Points, Lines and Planes Vocabulary

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Last updated 6:48 PM on 9/8/26
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18 Terms

1
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point

It marks a location and is named by a capital letter; it has no thickness and 0 dimension.

2
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line

An infinite set of points that goes on forever; it has no thickness and it is one dimensional.

<p>An infinite set of points that goes on forever; it has no thickness and it is one dimensional.</p>
3
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plane

A flat surface that goes on forever in two directions; an infinite set of points; it has no thickness and is two dimensional.

<p>A flat surface that goes on forever in two directions; an infinite set of points; it has no thickness and is two dimensional.</p>
4
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collinear

Points that lie on the same line.

<p>Points that lie on the same line.</p>
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noncollinear

Points that do not lie on the same line.

<p>Points that do not lie on the same line.</p>
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coplanar

Points that lie on the same plane.

<p>Points that lie on the same plane.</p>
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noncoplanar

Points that do not lie on the same plane.

<p>Points that do not lie on the same plane.</p>
8
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intersection

The set of points both figures have in common.

<p>The set of points both figures have in common.</p>
9
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segment

Part of a line consisting of two end points and all the points between them.

<p>Part of a line consisting of two end points and all the points between them.</p>
10
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ray

Part of a line that starts at a particular point and extends infinitely in one direction.

<p>Part of a line that starts at a particular point and extends infinitely in one direction.</p>
11
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perpendicular

Two lines that intersect to form right angles.

<p>Two lines that intersect to form right angles.</p>
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parallel

Lines that do not intersect but are in the same plane.

<p>Lines that do not intersect but are in the same plane.</p>
13
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skew

Lines that are not parallel and do not intersect.

<p>Lines that are not parallel and do not intersect.</p>
14
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opposite rays

Two rays that share a common endpoint but extends in opposite directions and makes a line.

<p>Two rays that share a common endpoint but extends in opposite directions and makes a line.</p>
15
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congruent segments

Segments that have the same length.

<p>Segments that have the same length.</p>
16
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midpoint

A point that divides a segment into two congruent segments.

<p>A point that divides a segment into two congruent segments.</p>
17
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segment bisector

A line that divides a segment at its midpoint to form two congruent segments.

<p>A line that divides a segment at its midpoint to form two congruent segments.</p>
18
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perpendicular bisector

A line that passes through the midpoint of a segment and is perpendicular to that segment.

<p>A line that passes through the midpoint of a segment and is perpendicular to that segment.</p>