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### 15 Cards in this Set

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 Undefined terms- -point -line -plane -A point has no dimension. It is represented by a dot. -A line has one dimension. It is represented by a line with two arrowheads, but it extends withought end. Through any two points, there is exactly one line. You can use any two pints on a line to name it. -A plane has two dimentions. It is represented by a shape that looks like a floor or a wall, but it extends without end. Through any three points not on the same line, thee is exactly one plane. You can use three points that are not all on the same line to name a plane. Defined Terms- -line segments -endpoints - a Line Segment is a part of a line that consists of two points called endpoints and all points on the line that are between the endpoints. Ray - A ray is a part of a line that consists of a point called an endpoint and all points on the line that extend in one direction Opposite Rays - If point C lies on AB between A and B, then A anmd B are opposite Rays Postulate - A postulate is a rule that is accepted without proof. Also called Axiom. Axiom - An axiom is a rule that is accepted without proof. Congruent Segments - Congruent Segments are Line Segments that have the same length. Midpoint - A midpoint is a point that divides, or bisects, a segment into two congruent segments. Segment Bisector - A segment Bisector is a point, ray, line, segment, or plane that intersects a segment at its midpoint. Angles- -acute -straight -right -obtuse - An acute angle is and angle with measure between 0 deg. and 90 deg. - A straight angle is an angle with measure equal to 180 deg. Congruent angles - Angles that have the same measure. Angle Bisector - A ray that divides an angle into two angles that are conguent. Linear Pair - Two adjacent angles whose noncommon sides are opposite rays. Vertical Angles - Two angles whose sides form two pairs of opposite rays. Polygon - A closed plane figure with the following properties. It is formed by three or more line segments called sides. Each side intersects exactly two sides with a common endpoint are collinear.