Unit 1
Definition of congruent segments
Segents that have equal length
Definition of complementary angles
two angle whose measures have a sum of 90
Definition of parallel lines
Coplanar lines that never intersect
Definition of congruent
Figures that are the same size and same shape
Definition of a parallelogram
Quadrilateral with both pairs of opposite sides are parallel
Definition of congruent angles
Angles that have equal measure
Definition of supplementary angles
two angles whose measure have a sum of 180
Definition of skew lines
Lines that are not coplanar
Definition of a median of a triangle
Segment from a vertex to the midpoint of the opposite side
Definition of a rectangle
Quadrilateral with four right angles
Definition of a midpoint of a segment
the point that divides the segment into two congruent segments
Definition of vertical angles
two angles whose sides form two pairs of opposite rays
Definition of a scalene triangle
Triangle with no congruent sides
Perpendicular segment from a vertex to the line that contains the opposite side
Definition of a rhombus
Quadrilateral with four congruent sides
A line, segment, ray or plane that intersects the segment at its midpoint
Definition of perpendicular lines
Two lines that intersect to form right angles
Definition of an obtuse triangle
triangle with one obtuse angle
Definition of a perpendicular bisector of a segment
Line, ray, or segment that is perpendicular to the segment at its midpoint
Definition of a square
Quadrilateral with four right angles and four congruent sides
Definition of an angle bisector
Midpoint Theorem
5 ways to prove two lines parallel
-show that a pair of corresponding angles are congruent
-show that a pair of alternate interior angles are congruent
-show that a pair of same-side interior angle are supplementary
-in a plane show that both lines are perpendicular to a third line
-show that both lines are parallel to a third line
5 ways to prove triangles congruent
-SSS postulate
-SAS Postulate
-ASA Postulate
-AAS Theorem
-HL Theorem
5 ways to prove a parallelogram
-show that both pairs of opposite sides are parallel
-show that both pairs of opposite sides are congruent
-show that both pairs of opposite angles are congruent
-show that one pair of opposite sides are congruent and parallel
-show that the diagonals bisect eachother