1. Unit 3 Day 5: Polygon sum

2. Agenda
Warm-up
Homework Check
3-4 Polygon Sum
Practice/Homework

3. Warm-up
Find < 3
Find < 4
2. Find x Find x
So that
L ll M

4. Homework Check 85 2. 30 3. 29 4. W = 37, t=62, v=118 5. n=143
4. W = 37, t=62, v= n=143
6, p= x=35, y=145, z=25
8. a=55, b=97, c= x=105
10. 3=22, 4=22, 5= = 44
12. X = =33, 2=52
14. 2= x=
17. x= obtuse

5. 3-4 Polygon Angle –Sum Theorem
A Polygon – A closed plane shape with at least 3 sides that are segments Concave: polygon with indentions Convex: polygon with no indentions

6. Naming Polygons
Name the Polygon:
Vertices:
Sides:
Angles:

7. Common Polygons
Name a polygon by the number of sides.

12. Regular Polygon – all sides and angles (equilateral and equiangular) The sum of the measures of the angles of an n-gon is 180(n-2)

13. Find the sum of the measures of the angles of…
Ex gon Ex gon

14. Ex. 3 : How many sides does a polygon have if the sum of the measures of the angles is 720?

15. The sum of the measures of the exterior angles of a polygon is 360.

16. Ex. 1. How many sides does a polygon have if each exterior angle is 15 ̊?

17. Find A

18. Complete the worksheet Polygon Angle sum
Homework
Complete the worksheet Polygon Angle sum