Vocabulary
An object that has a starting point and goes infinitely in one direction.
Ray
How many rays form the sides of an angle?
2
An angle that measures between 90 and 180 degrees.
Obtuse angle
Two lines that intersect and form four 90 degree angles.
Perpendicular lines
It takes this many points to make a line.
2
A basic geometric object that has two endpoints.
Line Segment
The name of the point where an angle 'bends.'
Vertex
An angle that measures between 0 and 90 degrees.
Acute angle
What is formed when two lines intersect?
Point
Points that lie on the same line.
Collinear
A geometric object that goes infinitely in two directions.
Line
The name given to non-adjacent angles formed by intersection lines.
Vertical angles
Two angles that share one side and form a line with the non-sharing sides.
Linear pair
What is formed when two planes intersect.
Line
Points that lie in the same plane.
Coplanar
A line, segment, or ray that cuts an angle or another segment in half.
Bisector
Two angles who sum of measures is 90 degrees.
Complementary angles
Two angles whose sum of measures is 180 degrees.
Supplementary angles
The term given to two lines or two planes that do not intersect.
Parallel
How many points are needed to form a plane?
3
Formed by two rays that have a common endpoint.
Angle
An angle measures 30 degrees, what is the measure of the angles complement?
60 degrees
An angle measures 100 degrees, what is the measure of the angles supplement?
80 degrees
The point in the middle of a line segment where a bisector would intersect the segment.
Midpoint
A flat surface that extends indefinitely in all directions.
Plane