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Areas Unit
Day3
Monday January 5,2009
January 5 Warm Up
 In a regular octagon,
1. Find the sum of the interior angles.
2. Find the sum of the exterior angles.
3. Find the measure of each interior angle.
4. Find the measure of each exterior angle.
5. If the measure of each interior angle of a regular polygon is 108°, then the polygon
is a(n) ______________.
6. A decagon has _________________ sides and vertices.
Homework Answers p. 431
2. 6
6. 48
10. 60
14. 18 3cm2
18. 150 3
22. 34.2
4. 12
8. 44
12. 9 3
16. 27 3
21. 18.2
23. 73.5
Homework Answers p. 436
2. A = 30.5, m = 5
6. b2 = 5, m = 4
10. 64
14. 94.5
18. 65
22. 120cm2, 17cm each
4. h = 10, m = 30
8. b1 = 15k, m = 9k
12. 21 3
16. 180
20. 71
Regular Polygons
A regular polygon is
 A polygon with all sides congruent and all angles congruent.
 Geometry Sketchpad
 Open Regular Polygon Notes from the share folder
Cool Down
 Classroom Exercises p. 442 6-8.
 Check your answers with Mrs. Baumher when
complete.
 HW p. 443 1-17
Quia Quiz
 Complete the area quiz on my geometry quia
page.
 www.quia.com/quiz/1403398.html
 When you have completed the quiz open
sketchpad, Regular Polygons Area Notes from
share folder. You will be saving this today to the
drop folder and printing a copy.