Basic Vocab
This is a line that extends indefinitely in one direction.
What is a ray?
The common endpoint of the angle
What is the vertex?
Angles 2 and 3
What are vertical angles?
Two angle that sum to be 180o
What are supplementary angles?
Two lines that never intersect?
What are parallel lines?
These are two lines that form a right angle
What are perpendicular lines?
What are adjacent angles
Angles 4 and 8
What are corresponding angles?
Two angles that are supplementary and adjacent
What is a linear pair?
How many letters it takes to name an angle?
what is 3?
This cuts a segment or angle in half
What is a bisector?
These are the sides of an angle
What are rays?
Angles 4 and 5
What are alternate interior angles?
Two angles that are across from each other when two lines intersect and are congruent
What are vertical angles?
An angle greater than 90 degrees
What is an obtuse angle?
A part of a segment plus a part of a segment equals the whole segment
What is the segment addition postulate?
Two angles with the same measure
What are congruent angles?
Angles 4 and 7
Two angles that sum to be 90o
What are complementary angles?
Two points that lie on the same line
What are collinear points?
This the average of the x values and the average of the y values of 2 points.
What is the midpoint formula?
A line, segment, or ray that cuts an angle into two equal parts
What is an angle bisector
Angles 1 and 8
What are alternate exterior angles?
An angle formed when two perpendicular lines intersect
What is a right angle?
Two points that lie on the same plane
What are coplanar points?