# Geometry 1

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A location with no size or shape

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### 32 Terms

1

A location with no size or shape

Point

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2

Made up of points with no thickness or width

Line

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3

A measurable part of a line consisting of two endpoints

Line segment

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4

A line that extends indefinitely in one direction

Ray

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5

A flat surface made up of points and extends indefinitely in a direction

Plane

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6

Points that lie on the same line

• Non-Collinear:points that don’t lie on the same line

Collinear

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7

Points that lie on the same plane

• Non-Coplanar:points that don’t lie on the same plane

Coplanar

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8

If two segments have the same length, then they are congruent

Congruent segments

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9

If A,B and C are collinear points and B is between A and C then AB+BC=AC

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10

The formula used to find the distance between two points on a coordinate plane

Distance formula

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11

The formula used to find the midpoint between two endpoints

Midpoint formula

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12

A segment, line, plane that can intersect a segment at its midpoint

Segment bisector

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13

A line segment with associated direction

Directed line segment

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14

The “run” of a directed line segment

Horizontal component

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15

The “rise” of a directed line segment

Vertical component

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16

Two lines that intersect at a 90° angle (right angle)

Perpendicular

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17

A line, segment, or ray perpendicular to a segment at its midpoint

Perpendicular bisector

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18

Two lines that never intersect

Parallel lines

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19

The intersection of two right at an endpoint

Angle

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20

The common endpoint of an angle (where two rays/sides, intersect)

Vertex

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21

An angle with a degree measure of 90°

Right angle

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22

An angle with a degree measure less than 90°

Acute angle

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23

An angle with a degree measure greater than 90°

Obtuse angle

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24

An angle with a degree measure of 180°

Straight angle

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25

Two angles that have the same measure are congruent

Congruent angles

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26

Two angles that share a common side and vertex “next to” each other

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27

<ABD and <DBC are adjacent, then <ABD+ <DBC=<ABC

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28

A line or ray that divides an angle into two equal parts

Angle bisector

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29

Two angles directly across from each other on intersecting

Vertical angles

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30

Two angles with measures that sum to 90°

• DO NOT have to be adjacent

Complementary angles

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31

Two angles with measures that sum to 180°

• DO NOT have to be adjacent

Supplementary angle

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32

Adjacent angles that are supplementary. Combine, they form a straight line

Linear pair

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