Types of angles
What is an angle less than 90 degrees?
Acute
A three-sided figure; angles sum to 180°
Triangle
Angles that are across from each when two lines intersect
Vertical angle
Two lines that never intersect
Parallel lines
What is and angle equal to 90 degrees
Right angle
A triangle containing three angles less than 90
Acute triangle
Angle that share a common ray and vertex; angle that are next to each other
Adjacent angles
A line that intersects two or more lines
Transversal
Obtuse angle
A triangle containing one 90 angle
Right angle
Angle that sum to 90 degrees
Complementary
Angles that are in the same position on the parallel lines in relation to the transversal; congruent
Corresponding angles
What is an angle equal to 180 degrees
Straight angle
A triangle containing one angle greater than 90 degrees
Obtuse triangle
Angles that sum to 180 degrees
Supplementary
Angles that are inside the parallel lines and on opposite sides of the transversal; congruent
Alternate interior angles