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30 Cards in this Set

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  • 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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