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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 non-consecutive 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