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### 50 Cards in this Set

• Front
• Back
 point indicates position on a line, or in a plane Line Set of points which extends infinitely in 2 directions Space Set of all points Collinear Points Are points all in one line Non Collinear Points 3 points not in one line Coplanar points Points all on one plane, you might not see the plane on which the points are on Non Coplanar Points Points that are not all on one plane Segment Part of a line, which consists of two end points and all points in between Ray Part of a line, which has one end point and extends infinitely in one direction Opposite Rays Collinear rays which share the same end point Postulate Statement accepted without proof Congruent Segments Are segments that have equal lengths Midpoint of a segment that divides the segment into two congruent segments Bisector of a segment A line, segment, ray, or plane that intersects the segment at its midpoint Angle Figure formed by two rays which have the same end point Acute angle Measures between 0 and 90 Right Angle Measures 90 Obtuse Angle Measures between 90 and 180 Straight Angle Measures 180 Congruent Angles Angles that have equal measures Bisector of an angle Ray that divides the angle into two congruent adjacent angles Complementary angles Two angles who measures have the sum 90 Supplementary Angles Two angles whose measures have the sum 180 Vertical Angles Non adjacent angles formed by intersecting lines Perpendicular lines Two lines that intersect to form right angles Parallel lines Coplanar lines that do not intersect Transversal Line that intersects two or more coplanar lines in different points Triangle Figure formed by three segments joining 3 non-collinear points Scalene triangle No sides are congruent Isosceles At least two sides are congruent Equilateral All sides are congruent Acute 3 acute angles Obtuse 1 obtuse angle Right 1 right angle Equiangular All angles are congruent Regular Polygon Polygon that is both equiangular and equilateral Congruent triangles Corresponding angles are congruent/corresponding sides are congruent Legs of an isosceles Triangle The congruent sides Base Side not congruent to either of the other sides Base Angles Angles, which include the base Vertex Angle Angle opposite the base Legs of an Isosceles Triangle The congruent sides Legs of a right triangle Sides, which make up the right angle Hypotenuse Side opposite the right angle Median of a triangle Segment from a vertex to the midpoint of the opposite side Altitude of a triangle the perpendicular segment from a vertex to the line that contains the opposite side Perpendicular bisector of a segment A line or ray or segment that is perpendicular to the segment at its midpoint SSS Postulate If 3 sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent SAS Postulate If 2 sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then the triangles are congruent ASA Postulate Of 2 angles and the included side of one triangle are congruent to 2 angles and the included side of another triangle, and then the triangles are congruent