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Chapter 1 Geometry Vocab
Francesca Araneta
39
Mathematics
9th Grade
10/18/2012

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Cards

Term
Coplanar
Definition
when multiple points are on the same plane.[image]
Term
Angle
Definition

formed by two rays (sides) with the same endpoint (vertex)

.[image]

Term
Midpoint
Definition

the center of a line segment.

[image]

Term
Bisector
Definition

a line that cuts a segment into two pieces/halves.

[image]

Term
Congruent
Definition

when two angles have the same measurement and size.

[image]

Term
Vertex
Definition

the endpoint of a line.

[image]

Term
Acute Angles
Definition

angles that have a measurement that is less than 90 degrees. 

[image]

Term
Obtuse Angles
Definition

obtuse angles are angles that are greater than 90 degrees.

[image]

Term
Straight Angles
Definition

angles that equal 180 degrees.

[image]

Term
Right Angles
Definition

angles that equal 90 degrees.

[image]

Term
Complementary Angles
Definition

angles that add up to equal 90 degrees.

[image]

Term
Supplementary Angles
Definition
angles that add up to equal 180 degrees.[image]
Term
Vertical Angles
Definition

opposite angles formed by the intersection of two lines.

[image]

Term
Adjacent Angles
Definition

angles that have the same vertex, share a common side, and do not overlap.

[image]

Term
Linear Pair
Definition

the two supplementary adjacent angles formed by two intersecting lines.

 

 [image]
Term
Perpendicular Lines
Definition

lines which meet to form right angles and whose slopes have a product of -1.

[image]

Term
Polygon
Definition

A simple closed figure in a plane formed by three or more line segments.

[image]

Term
Concave
Definition

A polygon for which a point on at least one of its diagonals lies outside the polygon.

[image]

Term
Convex
Definition

A polygon for which all diagonals are located in the interior of the polygon.

[image]

Term
Regular
Definition

A polygon that has all sides congruent and all angles congruent.

.[image]

Term
Irregular
Definition

A figure that cannot be classified as a single polygon.

[image]

Term
Diagonal
Definition

A segment joining two nonconsecutive vertices of a polygon.


Term
Side
Definition
The segments that form a closed figure.[image]
Term
Perimeter
Definition

The distance around a closed geometric figure.

[image]

Term
Point
Definition

A specific location in space with no size or shape.

[image]

Term
Line
Definition

A never-ending straight path.

[image]

Term
Segment
Definition

Part of a line containing two endpoints and all the points between them.

[image]

Term
Ray
Definition

A part of a line that extends indefinitely in one direction from a fixed point.

[image]

Term
Plane
Definition

A two-dimensional flat surface that extends in all directions.

[image]

Term
Opposite Rays
Definition

Two rays that are part of the same line and have only their endpoints in common.

[image]

Term
Collinear
Definition
Three or more points that lie on the same line.[image]
Term
Triangle
Definition
A polygon having three sides.[image]
Term
Quadrilateral
Definition

A polygon having four sides.

[image]

Term
Pentagon
Definition

A polygon having five sides.

[image]

Term
Hexagon
Definition

A polygon having six sides.

[image]

Term
Octagon
Definition

A polygon having eight sides.

[image] 

Term
Decagon
Definition

A polygon having ten sides.

[image]

Term
Dodecagon
Definition

A polygon having twelve sides.

[image]

Term
n-gon
Definition

A polygon with sides.

[image]

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