Geometry Chapter 2 -- Angles and Angle Relationships
complete/full angle
360 degree angle
right angle
90 degree angle
right angle
90 degrees
angles at a point
add up to 360 degrees
supplementary
angles that add up to 180 degrees
complementary
angles that add up to 90 degrees
angle bisector
a line or ray that divides an angle into 2 congruent angles
transversal
a line that intersects two or more other lines
postulate
a statement that is accepted as true
acute angle
between 0 and 90 degrees
reflex angle
between 180 and 360 degrees
obtuse angle
between 90 and 180 degrees
equidistant
equal length
angle
formed by 2 rays sharing a common endpoint
parallel lines' converse theorem
if two lines are cut by a transversal and form congruent corresponding angles, the lines are parallel
vertical angles
nonadjacent angles formed by intersecting lines
converse
something that is the opposite of something else
exterior angle theorem
the measure of the exterior angle in a triangle is equal to the sum of the two non-adjacent interior angles
angle sum theorem
the sum of interior angles of a triangle is 180 degrees
adjacent angles
two angles that have a common side, a common vertex and don't overlap
alternate exterior angles' theorem
when parallel lines are cut by a transversal, alternate exterior angles are congruent
alternate interior angles' theorem
when parallel lines are cut by a transversal, alternate interior angles are congruent
corresponding angles' postulate
when parallel lines are cut by a transversal, corresponding angles are congruent
straight angle
180 degrees
