1. Homework: 1-6, 9-17 Alg Rev #11 Due Friday
For each polygon, find (a) the interior angle sum and (b) the exterior angle sum.
Quadrilateral 2. Pentagon 3. Hexagon
4. Octagon 5. Decagon 6. n-gon
360, , , 360
, , (n-2)180, 360

2. Homework: 1-6, 9-17 Alg Rev #11 Due Friday
Sum of int angles of a pentagon =540
=270
270/2=135
Total = =140
Total = 720
720/6=120

3. Homework: 1-6, 9-17 Alg Rev #11 Due Friday

4. Homework: 1-6, 9-17 Alg Rev #11 Due Friday
360∙5=𝑠𝑢𝑚 𝑜𝑓 𝑖𝑛𝑡 ∠𝑠 1800=𝑠𝑢𝑚 𝑜𝑓 𝑖𝑛𝑡 ∠𝑠 1800= 𝑛− =𝑛−2 𝑛=12
12𝑥=180 𝑥=15
11x=165
(n-2)180 =165(n)
180n-360=165n
15n=360
N=24 x
11x

5. (hint – use colored pencils!)
Finding the Number of Diagonals in a polygon….
(hint – use colored pencils!)

8. Construct an equilateral triangle.

9. Construct a Square

10. FOR FUN! Use the instructions to construct a pentagon!

11. HW: Page 105, #21 and 22.
Page 88
Use the givens for problem 20 to prove ∠1=∠3.
Use the given for 21 to prove ∠ 1=∠ 4.
Complete all.