Lines, Points, Rays
Angles
100
This is a straight path that continues on and on in both directions without ever ending.
What is a line
100

This is formed by two rays that meet at an endpoint.

What is an angle

200
This is part of a line between 2 endpoints.
What is a line segment
200
This type of angle is exactly 90 degrees.
What is a right angle
300
This is a part of a line that has one endpoint and continues without end in one direction.
What is a ray.
300
This type of angle is more than 0 degrees, but less than 90 degrees.
What is an acute angle
400
A line segment, point, and ray are all part of this.
What is a line.
400
This type of angle is between 91 degrees and 179 degrees.
What is an obtuse angle
500
This divides a shape into two equal parts.
What is a line of symmetry
500

Susan made an angle that measures 80 degrees. When she went to label her angle, she called it a right angle. Is she correct? How do you know?

No she is not correct. 80 degree angle would be an acute, not a right angle. 

M
e
n
u