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30 Cards in this Set
 Front
 Back
Point

the most basic building block of geometry


Line

a straight, continuous arrangement of infinitely many point


Plane

a flat surface
that extends infinitely along its length and width >NO THICKNESS 

Definition

a statement that clarifies or explains the meaning of a
word or a phrase 

Collinear

on the same line


Coplanar

on the same plane


Line segment

two points called the endpoints of the segment
and all the points between them that are collinear with the two points 

Endpoints

the two points on a line segment that have all the points between them that are collinear


Congruent segments

segments that have the same measure or length


Midpoint

the point on the segment that is the same
distance from both endpoints 

Bisects

divides the segment into two congruent segments


Ray

any of a group of lines diverging from a common center


Angle

two rays that share a common endpoint, provided that the two rays are noncollinear


Vertex

The common endpoint of the two rays


Sides (angle)

the two rays of an angle


Measure of an angle

the smallest amount of rotation about the vertex from one ray to the other, measured
in degrees 

Degrees

a unit of measure for angles equal to an angle with its vertex at the center of a circle and its sides cutting off 1/360 of the circumference


Protractor

The geometry tool you use to measure an angle


Congruent angles

two angles that have the same measure


Angle bisector

A ray that contains the vertex and divides the angle into two congruent angles


Incoming angle

ormed by the cushion and the path of the ball approaching the cushion


Outgoing angle

formed by
the cushion and the path of the ball leaving the cushion 

Polygon

a closed figure in a plane, formed by connecting line segments endpoint to endpoint with each segment intersecting exactly two others


Side (polygon)

each line segment


Vertex (polygon)

Each endpoint where the sides
meet 

Diagnol

line segment that
connects two nonconsecutive vertices 

Convex (polygon)

no diagonal is outside the polygon


Concave (polygon)

at least one diagonal is outside the polygon


Congruent polygons

two polygons that are exactly the same in size and shape


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