1. Exploring
Polygons

2. What is a polygon?
Polygons are many-sided figures, with sides that are line segments. Polygons are named according to the number of sides and angles they have.
Can be “regular” – all sides and all angles are equal to each other

3. Isosceles Triangles Two sides of equal length Three acute angles
Sum of angles = 180°

4. Equilateral Triangles
All sides equal length
Three acute angles
Sum of angles = 180°
Is a regular polygon

5. Scalene Triangles No sides are equal No angles are equal
May have obtuse angle
Sum of angles = 180 °

6. Rectangles Opposite sides are parallel
Opposite side are equal in length
Each angle equals 90°
Sum of angles = 360°

7. Squares All sides equal All angles equal and are 90 ° each
Sum of angles = 360 °
Is a regular polygon

8. Trapezoids Two sides are parallel Has obtuse and acute angles
Sometimes has a right angle
Sum of angles = 360 °

9. Rhombuses (rhombi) All four sides of equal length
Opposite angles are equal – 2 acute angles, 2 obtuse angles
Sum of angles = 360 °
Regular polygon

10. Parallelograms Opposite sides parallel Opposite sides equal in length
Opposite angles equal
Sum of angles = 360 °

11. Pentagons
5 sides
Sum of angles = 540 °
Regular polygon

12. Hexagons
6 sides
Sum of angles = 720 °
Can be regular polygon

13. Octagons
8 sides
Sum of angles = 1080 °
Can be regular polygon

14. Decagons
10 sides
Sum of angles = 1440°
Can be regular polygon