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Chapter 1 note cards

part one 1.1,, 1.2 1.3

Undefined Term A word that does not have a formal definition but there is agreement about what the word means.
Point A point has no dimension. It is usually represented by a dot.
Line A line has one dimension. It is usually represented by a straight line with two arrowheads to indicated that the line extends without end in two directions.
Plane A plane has two dimensions. It is usually represented by a shape that looks a floor or a wall. You must imagine that the plane extends without end, even though the drawing of a plane appears to have edges.
Collinear points Point that lie on the same line.
Coplanar points Points that lie on the same plane.
Defined terms Terms that can be described using known words.
Line segment Part of a line that consists of two points. called endpoints , and all points on line that are between the endpoints. Also called segment.
Endpoints Part of a line that consists of two points, called endpoints.
Ray Part of a line that consists of a point called an endpoint and all points on the that extend in one direction.
Opposite Rays If point C lies on line AB between A and B then line CA and line CB are opposite rays.
Intersection The set of points that two or more geometric figures have in common
1.2 card
Postulate A rule that is accepted without proof. Also called axioma
Coordinate of a point The real number that corresponds to a point on a line.
Distance between points The absolute value of the different of the coordinates of the points. The distances between points A and B written as AB, is also called the length of line AB.
Ruler Postulate A rule that is accepted without proof.
Segment Addition Postulate It says that if B is between A and C, then AB + BC = AC. The converse is also the same. If AB + BC = AC, then B is between A and C. The segment addition postulate is used often in proofs involving the congruence of segments.
Congruent segment Line segments that have the same length.
1.3 cards
Midpoint A point that divides , or bisects, a segment into two congruent segments.
Segment bisector A point,ray,line,segment,or plane that intersect a segment at its midpoint.
Distance formula D equals the square roots of (X2-X1)squared plus (Y2-Y1)squared.
Midpoint formula You take the two numbers and you add them together and then divide their sum by 2.
Created by: cmoroder