1. Homework Questions

2. Entry Task
Henry wants to wallpaper the four walls of his bedroom. The room is rectangular and measures 11 feet by 13 feet. The ceiling is 10 feet high. A roll of wallpaper at the store is 2.5 feet wide and 50 feet long. How many rolls should he buy? Explain. (Wallpaper is hung from ceiling to floor. Ignore doors and windows.)

3. Area of Regular Polygons
8.4 Notes

4. Area of Regular Polygons
s = length of each side
a = length of the apothem
(height of the triangle)
n = number of sides in
the regular polygon

5. Example 1
Find the area of the regular polygon

6. Example 2
Find the area of the regular polygon

7. Example 3
Find the area of a regular pentagon with an apothem of 6 and a perimeter of 25.

8. Example 4 Find the apothem of a regular hexagon with an area of
and sides of 4.

9. Example 5
Find the area of the hexagon inscribed in a circle with a circumference of 8 .

10. Homework
Pg. 435 #1, 4
Pg. 443 #1-8, 14, 15, 21
Read pages on the different 3 dimensional figures