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# Area Of Circles

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### Transcript

• 1. Area of Circles
Today you will learn to find the area of circles.
• 2. Review
diameter (d)
d=2r
• 3. Area of Circles
The area of a circle is equal to the product of pi () and the square of it’s radius.
A=r2
• 4. Area of Circles
Find the area of the circle below.
A=r2
A≈ 3.14(3)2
A≈ 3.14(9)
A≈ 28.26 m2
3 m
• 5. Area of Circles
Find the area of a circle with
Remember to show all of your work!
• 6. Area of Circles
A=r2
A≈ 3.14(10)2
A≈ 3.14(100)
A≈ 314 cm2
• 7. Area of Circles
Find the area of a circle with a diameter of 10 m.
A=r2
You must find the radius before you can find the area!
• 8. Area of Circles
Find the radius by dividing the diameter by 2.
d=10 m
r=d÷2
r=10÷2
r= 5 m
• 9. Area of Circles
Now that you have found the radius of the circle, you can find the area.
A=r2
A ≈ 3.14(5)2
A ≈ 3.14(25)
A ≈ 78.5 m2
• 10. Area of Circles
Now it’s your turn to try one!
Find the area of a circle with diameter 40 mm.
• 11. Area of Circles
A=r2
A ≈ 3.14(20)2
A ≈ 3.14(400)
A ≈ 1256 mm2
• 12. Area of Circles
Homework: Practice Workbook
Lesson 11-6
Don’t forget to show all of your work!