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33 Cards in this Set
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 Back
acute angle

An angle whose measure is less than 90° and more than 0°


angle

Two rays that have a common endpoint make an angle.


angle bisector

A ray that starts at the vertex of an angle that divides the angle in to two angles of equal measure


collinear points

Points that lie on the same line.


complementary angles

Two angles whose measures have the sumof 90°


concave polygon

A polygon with one side that angles in


congruent polygons

Two polygons are congruent when the have the same size and same shape


consecutive vertices

Consecutive: going in order, next to each other


convex polygon

All the vertices are pointing out


coplanar points

Points that lie on the same plane.


diagonals

A line segment that connects any two nonconsecutive vertices


equiangular polygons

A polygon whose angles are all the same measure


equilateral polygons

A ploygon whose sides are all the same length


line

A straight arrangement of points that goes forever in both directions


line segment

Part of a line with two endpoints.


linear pair of angles

A pair of angles on the same line.


midpoint

A point that is equally distant from the two endpoints


obtuse angle

An angle whose measure is more than 90° and less than 360°


parallel lines

Two or more lines that lie in the same plane and do not intersect


perimeter

Sum of all the sides, like a fence


perpendicular lines

Two lines that intersect to form a right angle


plane

A flat surface that goes forever in all directions.


point

The basic unit of geometry. It has no size, just location.


polygon

A closed geometric figure


ray

A part of a line that has a beginning but no end


regular polygon

A polygon whose angles and sides are all the same measure


right angle

An angle whose measure is 90°


side

Line segment connecting 2 vertices


skew lines

Lines that are not in the same plane and that do not intersect


space

Set of all points.


supplementary angles

Two angles whose measures have the sum of 180°


vertex

Angle of polygon


vertical angles

A pair of angles directly across from each other
