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### 60 Cards in this Set

• Front
• Back
 Point No definition Line No definition Plane no definition Collinear points Points that lie on the same line Coplanar points Points that lie on the same plane Space set of all possible points Line segment A set of two points and all the collinear points between them Ray Part of a line consisting of a single point and all points on that line that lie on the same side of the original point Angle the union of two non collinear rays with a common end point Right angle An angle whose measure is 90 degrees Acute angle and angle whose measure is less than 90 degrees but more than 0 Obtuse angle an angle whose measure is more than 90 degrees and less 180 Midpoint of a segment A point that divides a segment into two equal parts angle bisector a line or ray that divides an angle into two equal parts parallel lines two or more lines that are coplanar and do not intersect Skew lines non coplanar lines Parallel segments two segments are parallel if the lines that contain them are parallel Parallel rays Two rays are parallel if the lines that contain them are parallel Perpendicular lines Lines that intersect to form a right angle A pair of complementary angles two angles whose sum is 90 degrees a pair of supplementary angles two angles whose sum is 180 degrees Vertical angles two adjacent angles formed by to intersecting lines Linear pair of angles two adjacent angles whose non common sides form a striaght line Polygon a closed geometric figure in a plane, formed by connecting line segments endpoint to endpoint with each segment intersecting exactly two others concave polygon one in which there is a line that contains on of the sides but passes through the interior convex polygon one that is not concave Triangle a 3 sided polygon quadrilateral a 4 sided polygon pentagon a 5 sided polygon hexagon a 6 sided polygon heptegon a 7 sided polygon octagon an 8 sided polygon nonagon a 9 sided polygon decagon a 10 sided polygon undecagon an 11 sided polygon dodecagon a 12 sided polygon icosagram a 20 sided polygon Consecutive verices of a polygon two vertices that are endpoints of the same side consective sides of a polygon two lines that intersect at the same vertex consecutive angles two angles whose veritices are the endpoints of a side adjacent angles two angles with a common side and a common vertex Diagonals of a polygon a line segment connecting two non consecutive vertices Equilateral polygon a polygon whose sides are all congruent Equiangular polygon a polygon whose angles are all congruent Regular polygon A polygon that is equilateral and eqiangular Right triangle a triangle that has exactly one right angle acute triangle a triangle where all angles are acute obtuse triangle a triangle where exactly one angle is obtuse scalene triangle a triangle with no congruent sides Isosceles triangle a triangle with at least two equal sides median of a triangle a line segment with one endpoint at a vertex and the other endpoint at the midpoint of the opposite side Altitude of a triangle A line segment from a vertex that is perpendicular to the line containing the opposite side trapezoid a quadrilateral with e xactly one set of parallel sides Isosceles trapezoid A trapezoid with congruent legs Kite A quadrilateral with two distinct sets of consecutive congruent sides right kite A kite whose non vertex angles are right angles parallelogram a quadrilateral with two sets of parallel sides Rhombus An equilateral quadrilateral Rectangle an equiangular quadrilateral Square a regular quadrilateral