1. Investigation 3 Area and Circumference of Circles
Circles and using pi

2. Homework
Book A 8,9,10,11,24,26,28,30,31,48 B 8,9,11,21,22,26,28,30,31,34,50 IXL W1 and W5

3. Vocab
Diameter Distance across a circle that goes through the center Radius half the diameter, goes from center to any point on circle Circumference distance around a circle Center Point that is equidistant from the side (circle), inside

4. Invest 3.1 Going Around in Circles: Circumference
What is the relationship between the diameter or radius of a circle and its circumference?

5. Notes
Understanding the terms Diameter = 2 times radius Radius = ½ diameter Circumference = 2*pi*radius or pi*diameter

6. Example
Pg 51 problem 3.1

7. Homework
You should be able to have the following problems finished 8 and 9

8. Invest 3.2 Pricing Pizza: Connecting Area, Diameters and Radius
How does the area of a circle increase as the circle’s radius and diameter increase?

9. Notes
Finding the area of a circle Area = pi* radius^2 Know how to work forwards and backwards with circumference to get radius to then get area

10. Example

11. Example
Pg 53 problem 3.2

13. Homework
You should be able to have the following problems finished A 10, 11, 48 B 11,21,22

14. Invest 3.3 Squaring a Circle to Find Area
What is the relationship between the area of a circle and its radius?

15. Example
Pg 54 problem 3.3

16. Homework
You should be able to have the following problems finished A 24,26,28 B 26,28,50

17. Invest 3.4 Connecting Circumference and Area
What is the relationship between the circumference and area of a circle?

18. Notes
Pi is approximately 3.14, symbol Be able to go form Circumference to area and vice versa

19. Example Video
Pg 57 problem 3.4