Points and Lines
How many endpoints does an interval have?
2 endpoints
In ∠PQR, which point is the vertex?
Q (the middle letter)
What type of angle measures exactly 90°?
A right angle
What is the difference between a line and a ray?
A line goes on forever in both directions. A ray has one endpoint and goes on forever in one direction.
Write another way to name ∠XYZ.
∠ZYX (or ∠Y if it is the only angle at Y)
Classify an angle of 205°.
Reflex (between 180° and 360°)
What do we call three or more points that lie on the same straight line?
Collinear points
Rays OA, OB and OC start at point O, with OB between the other two. Name all three angles.
∠AOB, ∠BOC and ∠AOC
A clock shows 4:00. What type is the smaller angle between the hands, and how big is it?
Obtuse, 120° (each hour is 30°)