Concave Polygon Convex Polygon

Pentagon: 5 sides

Hexagon: 6 sides

Octagon: 8 sides

Decagon: 10 sides

1= Concave2= Convex

This angle is half the size of a right

angle

If you put three of these angles

together, you will get a right angle

This angle is 30° larger than a right

angle

This angle is 10° smaller than a straight angle

1. Add two known angles

2. Subtract sum from 180°

Straight Angle: 180°

Degree= measure for angles, uses the symbol °

90°180°

HomeworkFind the missing angle.