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Area Of Circles
Area Of Circles
Area Of Circles
Area Of Circles
Area Of Circles
Area Of Circles
Area Of Circles
Area Of Circles
Area Of Circles
Area Of Circles
Area Of Circles
Area Of Circles
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Area Of Circles

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  • 1. Area of Circles
    Today you will learn to find the area of circles.
  • 2. Review
    diameter (d)
    radius (r)
    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
    Your turn:
    Find the area of a circle with
    radius 10 cm.
    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!

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