Geometry Lesson 3: Angles
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11 Terms
What is a ray?
A ray is a part of a line that starts at an endpoint and extends infinitely in one direction.
What are opposite rays?
They are two rays that have a common endpoint and form a line.
What is an angle?
An angle is a figure formed by two rays with a common endpoint.
What is a vertex?
A vertex is the common endpoint of the two rays that create an angle.
What is a protractor?
It is a tool used to measure angles.
What is an acute angle?
An acute angle is an angle that measures greater than 0 degrees and less than 90 degrees.
What is an obtuse angle?
An obtuse angle is an angle that measures greater than 90 degrees and less than 180 degrees.
What is a right angle?
A right angle is an angle that measures exactly 90 degrees.
What is a straight angle?
A straight angle is an angle that measures exaclty 180 degrees.
What is bissecting a figure?
Bissecting a figure is dividing it into two congruent parts.
What is an angle bisector?
It is a ray that divides an angle into two congruent angles.