1. 7th Grade Math
The Angel of Angles

2. Angle Facts Angles form when two rays meet at a common endpoint.
The meeting point of two rays is called the vertex.
Angles are named either by one letter assigned to the vertex (∠G) or three letters with the vertex in the center and the other two letters denoting the rays (∠RGH).
Angles are measured in units called degrees. G R H
(Vertex)
(Ray)

3. Angles are classified by size.
Right angles
Straight angles
Acute angles
Obtuse angles

4. Right Angles
Angles that measure exactly 90º

5. Straight Angle
An angle that measures exactly 180º

6. Acute Angles
Angles that measure less than 90º

7. Obtuse Angles
Angles that measure more that 90º

8. Acute, Obtuse, Right, Straight
Can you identify the angle?
Acute, Obtuse, Right, Straight

9. Acute, Obtuse, Right, Straight
Can you identify the angle?
Acute, Obtuse, Right, Straight

10. Acute, Obtuse, Right, Straight
Can you identify the angle?
Acute, Obtuse, Right, Straight

11. Acute, Obtuse, Right, Straight
Can you identify the angle?
Acute, Obtuse, Right, Straight

12. Acute, Obtuse, Right, Straight
Can you find all the angle types?
Acute, Obtuse, Right, Straight