Area Of Circles
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Area Of Circles

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Area Of Circles Presentation Transcript

  • 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!