Angles
An angle with a degree measure of 180°
The common endpoint of an angle (where the sides intersect)
What is a vertex?
Made up of points with no thickenss or width.
What is a line?
A flat surface made up of points and extends indefinitely in all directions.
A line that extends indefinitely in one direction.
What is a ray?
The intersection of two rays at an endpoint.
What is an angle?
Adjacent angles that are supplementary. Combined they form a straight line.
What is a linear pair?
Two lines that never intersect. (symbol: ∥)
What is parallel lines?
Two angles that share a common side and vertex
What is adjacent angles?
A line, segment, or ray perpendicular to a segment at its midpoint.
What is segment bisector?
Two angles with measures that sum to 90° (do not have to be adjacent)
What is complementary angles?
If A, B, and C are collinear points and B is between A and C, then AB+BC=AC
What is segment addition postulate?
Two lines that intersect at a 90° angle (right angle) *symbol: ⊥*
What is perpendicular lines?
A line or ray that divides an angle into two equal parts.
What is angle bisector?
A measurable part of a line consisting of two endpoints.
What is a line segment?
Two angles with measures that sum to 180° (do not have to be adjacent)
What is supplementary angles?
Points that line of the same plane.
What is coplanar?
An angle with a degree measure less than 90°
What is acute angle?
A segment, line, or plane that intersects a segment at its midpoint.
What is a segment bisector?
If two segments have the same length, then they are...
What is congruent segments?
Two angles that have the same measure are...
What is congruent angles?
The sum of the measure of two adjacent angles is equal to the measure of the angle formed by the non-common sides of the two adjacent angles
An angle with a degree measure greater than 90°
What is an obtuse angle?
Two angles directly across from each other on intersecting lines. (always congruent)
What is vertical angles?
Points that lie on the same line.
What is collinear?