Geometry Review: Chapters: 1-1, 1-2, 1-3

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Line

Made up of points and has no thickness or width.

Line segment

Part of a line with two endpoints. The length or measure can not be negative.

Noncoplanar

Points that do not lie on the same plane.

Distance Formula

d = √[( x₂ - x₁)² + (y₂ - y₁)²]

Collinear

points that lie on the same line.

midpoint formula

(x₁+x₂)/2, (y₁+y₂)/2

Space

A boundless three-dimensional set of all points. It can contain lines and planes.

Plane

A flat surface made up of points. It has no depth and extends infinitely in all directions.

Segment Addition Postulate

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

Missing Endpoint Formula

Midpoint * 2 - endpoint

Undefinied terms

Point, line, and plane are considered ________ because they are only explained using examples and descriptions.

Coplanar

Points and lines that lie on the same plane.

Noncollinear

Points that do not lie on the same line.

congruent

When segments have the same measure.

segment bisector

a segment, ray, line, or plane that intersects a segment at its midpoint.

Number Line Formula

a+b/2

Pythagorean Theorem

a²+b²=c²

Point

is a location.


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