1. Angles in Polygons 11/13/09

2. review Warm up quiz Model Drawing Check homework if assigned

3. review What are complementary angles? 2 angles = 90o

4. review What are supplemental angles? 2 angles = 180o

5. review Degrees in interior angle measures of a triangle? 180o

6. review Degrees in interior angle measures of a quadrilateral? 360o

7. EQ: How can I find the sum of the interior angle measures in any polygon?

8. How can we prove how many interior angle measures are in a quadrilateral? Used diagonals.

9. Draw a quadrilateral. Draw diagonals. How many triangles are there?

10. How can we prove how many interior angle measures are in a pentagon? Used diagonals.

11. Draw a pentagon. Draw diagonals. How many triangles are there?

12. How many degrees are in each triangle? How many total interior degrees are there in pentagon?

13. Interior measure chart Make a chart: 3 columns-10 rows

14. 1: figure 2: Sum of <s 3: Increase from last figure.

15. Under figure draw: Triangle Quadrilateral Pentagon Hexagon

16. Heptagon (seven) Octagon Nonogon (nine) Decagon (last one) Complete the chart

17. What patterns do you see? How much do the < measures of each go up each time?

18. EQ: How can I find the sum of the interior angles in any polygon?