1. Concave Polygon
Convex Polygon

2. Pentagon: 5 sides
Hexagon: 6 sides
Octagon: 8 sides
Decagon: 10 sides

3. 1= Concave 2= Convex

5. This angle is half the size of a right angle
If you put three of these angles together, you will get a right angle

6. This angle is 30° larger than a right angle
This angle is 10° smaller than a straight angle

8. Add two known angles
Subtract sum from 180°

9. Straight Angle: 180°

10. Degree= measure for angles, uses the symbol °
180°
90°

11. Homework
Find the missing angle.