This is the building block of everything in Geometry. It is a "dot" in space, often labeled with a single letter of the alphabet.
What is a point?
This angle is greater than 0 degrees, but less than 90 degrees.
What is an acute angle?
This is a word that describes angles or shapes that are exactly the same size & shape.
What is congruent?
This is what we call the point where two lines cross.
What is an intersection?
Two lines that move in the same direction but never cross.
What are parallel lines?
This connects two points, which act like endpoints. It does not go on forever in either direction.
What is a segment?
This angle is 90 degrees exactly.
What is a right angle?
This a word that describes angles that touch each other (share a ray as a side), but do not overlap at all.
What is adjacent angles?
This is the point where two rays originate from, creating an angle. It is also a corner for any polygon.
What is a vertex?
These are lines that cross each other at a perfect 90 degree angle.
What are perpendicular lines?
This connects two points but continues all the way through them, going on towards infinity in both directions.
What is a line?
This angle is greater than 90 degrees but less than 180 degrees.
What is an obtuse angle?
This word describes angles that add up to 180 degrees.
What is supplementary?
What is collinear?
When two lines cross each other, the angles directly across from each other are equal in measure and are called this.
What are vertical angles?
This originates from a single endpoint, and moves in one direction through a second point. It passes through the second point, traveling forever.
What is a ray?
This an angle that is 180 degrees exactly.
What is a straight angle?
This word describes angles that add up to 90 degrees.
What is complementary?
This is the name for four or more points that fall on the same plane.
What is coplanar?
If a line cuts a segment or angle perfectly in half, we give it this special name.
What is a bisector?
This is a two-dimensional flat surface that extends without end. It is made up of many points and has no thickness.
What is a plane?
This is angle greater than 180 degrees, but less than 360 degrees.
What is a reflex angle?
This tool can be used to measure angles.
What is a protractor?
This is what we call the point where an x and y axis cross each other in a coordinate plane.
What is the origin?
The name we give a line that cuts a segment perfectly in half at a perfect 90 degree angle.
What is a perpendicular bisector?