1. Area of Circle

2. What do you get when you cross an insect with the Easter bunny?
JOKE of the DAY
What do you get when you cross an insect with the Easter bunny?
Do Now
Take your notebook and folder from your cubby. Then:
Find the RADIUS, DIAMETER, CIRCUMFERENCE, and AREA of the circle to the right
5cm

3. Do Now Take your notebook and folder from your cubby. Then:
JOKE of the DAY
What do you get if you divide the circumference of a jack-o-lantern by its diameter?
Do Now
Take your notebook and folder from your cubby. Then:
Find the RADIUS, DIAMETER, and CIRCUMFERENCE of the circle to the right
14ft

4. Agenda Do Now/ Hook: 5 min Notes: 10 – 15 min Explore: 15 min
Guided Practice: 15 min
Clean Up: 5 min
2 minutes
We are a TEAM of CONFIDENT PROBLEM SOLVERS & EFFECTIVE COMMUNICATORS

5. Announcements HW Due Monday Quiz Tuesday/Wednesday Tutoring Sign Ups
Tickets & Auction FRIDAY
2 minutes
We are a TEAM of CONFIDENT PROBLEM SOLVERS & EFFECTIVE COMMUNICATORS

6. Parts of a Circle – Review
Circumference: Perimeter of circle, distance around
Formula: C = 2 * r * π
Radius: Distance from the center to the edge of the circle
r = d/2
Diameter: Distance across the center of the circle
d = 2r
Pi (π): Ratio of circumference to diameter. Always equals 3.14
Area: Space inside a figure. Formula for circles:
A = π * r2

7. Area = Pi * Radius Squared
Today’s Formula:
Area = Pi * Radius Squared
A = π * r2

8. Examples

9. Area Explore Trace the circular item on your graph paper
With a ruler, measure the radius of the circle (from the center of the circle to the edge). Record your answer in inches in your notebook
Using the A = π * r2 formula, calculate the expected area of the circle. Record your answer in inches in your notebook
Look at how many square boxes make up the area of this circle. Estimate how many complete square boxes are inside the circle.
Compare the expected Area from the formula with the actual measured Area from Step 3

10. Whiteboard Practice Show work Use markers only for the math
Do not raise boards until I count to 3
Cap markers and flip boards over when we go over problems

11. Question 1
What is the area of this circle? A. 6 inches squared B inches squared C inches squared D. 9.4 inches squared
3in
A = π * r2

12. Question 2
What is the area of this circle? A. 144 π inches squared B. 36 π inches squared C. 6 π inches squared D. 3 π inches squared
6in
A = π * r2

13. Question 3
What is the area of this circle? A feet squared B. 22 feet squared C. 44 feet squared D feet squared
14ft
A = π * r2

14. Question 4
Khyren made a pizza with a diameter of 10 inches. What is the area of his pizza?
78.5 inches squared
314 inches squared
17.2 inches squared
25 inches squared
A = π * r2

15. Question 5
Mycynthia is building a circular bird pool in her backyard. If the distance from the center of the pool to the edge is 4ft, what is the area of the pool? A feet squared B feet squared C. 16 feet squared D feet squared
A = π * r2

16. Independent Practice Work independently or with your table
Stay seated and raise your hand silently if you have a question
When finished, work on challenge problems (on back)