Justifications Flashcards
Perpendicular lines
Have negative reciprocal slopes
Parallel lines
Have the same slope
Median
Divides a segment into two congruent segments
Midpoint
Divides a segment into two congruent segments
Angle bisector
Divides an angle into two congruent angles
Altitude
Forms congruent right angles
Perp. Bisector
Forms congruent right angles and divides a segment into two congruent segments
Intersecting lines
Form congruent vertical angles
Linear pair
Angles form a linear pair are supplementary
Ang. At point
Angles at a point have a sum of 360
Parallel lines cut by a transversal form
Corr ang
Congruent corresponding angles.
Parallel lines cut by a transversal form
Alt ext
Congruent alternate interior angles. Congruent alternate exterior angles.
Parallel lines cut by a transversal form
Supp
Same side interior angles that are supplementary
Interior angle of a triangle
Interior angles of a triangle have a sum of 180
Ext. ang. of a tri.
The exterior angle of a triangle is equal to the sum of the two nonadjacent interior angles
Base angles
The base angles of an isosceles triangle are congruent
Ext. ang. Non adj
An exterior angle equals the sum of the non adj. int. angles
