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### 32 Cards in this Set

• Front
• Back
 point no size represented by a dot has location line collection of points going in opposite directions no thickness one dimensional Plane flat surface goes on forever in all directions 2 dimensional has no bounds need at least 3 points to name it Space collection of all points Collinear points points that are on the same line non-collinear points points that are not on the same line need at least 3 points to be non-collinear coplanar points points in the same plane non-coplanar points points not on the same plane need at least 4 points to be non-coplanar segment section of a line with 2 end points ray section of a line with one endpoint and all points extending in one direction from the endpoint opposite rays rays with the same endpoint headed in opposite directions congruent segment segments with the same length midpoint of a segment divides the segment into two congruent segments bisector of a segment a line, ray, segment, or a plane that goes through the midpoint of a segment. angle a figure formed by two rays that have the same endpoint acute angle between 0º and 90º right angle 90º obtuse angle between 90º and 180º adjacent angles angles with a common vertex and a common side one is NOT inside the other bisector of an angle a ray that divides an angle into two congruent angles perpendicular lines two lines that form right ∠'s vertical ∠'s 2 ∠'s whose sides form two pairs of opposite rays complementary ∠'s 2 ∠'s whose sum is 90º supplementary ∠'s 2 ∠'s whose sum is 180º Parallel lines coplanar lines that do not intersect skew lines noncoplanar lines that do not intersect parallel planes planes that do not intersect transversal a line that intersects two or more coplanar lines corresponding ∠'s (corr ∠'s) tow ∠'s in corresponding positions alternate interior ∠'s (AIA's) 2 nonadjacent interior ∠'s on oppposite sides of a transversal alternate exterior ∠'s (AEA's) outside opposites Same-Side Interior ∠'s (SII's) ∠'s on the same side of the transversal within the two lines