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### 31 Cards in this Set

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 Point no size, no dimensionrepresented by a dot Line one dimensionrepresented by a line with 2 arrowheads Plane two dimensionsflat surfaceextends in all directionsnamed by at least 3 points Line Segment two endpoints Ray part of a line with one endpoint opposite rays same endpointopposite directions collinear two points on same line coplanar points 2 points on same Postulate a statement that is accepted without proof Theorem a rule that must be proved true ruler postulate allow you to measure in the length of segments Segment Addition Postulate If B is between A and C then AB+BC=ACIf AB+BC=AC then B is between A and C. Congruent Segments have equal length Midpoint divides a segment into two congruent segments Segment Bisector a line, ray, or segment that intersects a seg at its midpoint Angle consists of two rays with a common endpoint Protractor Postulate allows us to measure the size of angles in degrees Angle Addition Postulate if P is on the interior of Angle ABC, then the measure of angle ABP+the measure of angle PBC= the measure of angle ABC Congruent Angles have equal measure Angle Bisector a ray that divides an angle into 2 congruent angles Complementary Angles a pair of angles whose sum is 90 Supplementary Angles a pair of angles whose sum is 180 Adjacent Angles A pair of angles that share a vertex on the side but have no common interior points Linear Pair two adjacent angles are a linear pair if their non common sides form opposite rays Linear Pair Postulate angles in a linear pair are supplementary Vertical Angles 2 angles are vertical angles if their sides form two pairs of opposite rays Polygon Formed by 3 or more sides and each side intersects exactly two other sides, one at each endpoint, no 2 sides with a common endpoint are collinear Convex no line that contains a side goes through the interior of the polygon Equilateral polygon all sides are congruent Equiangular all angles are congruent Regular Polygon both equilateral and equiangular