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Do Now

Do Now. Write down 10 things that are round, or look round, be creative Share with your table group Choose one to share with me (do not repeat other group’s choice). Circumference & Area of Circles. March 6 th , 2014. Behavior . Sit up straight Track the speaker Ask and answer

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Do Now

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  1. Do Now • Write down 10 things that are round, or look round, be creative • Share with your table group • Choose one to share with me (do not repeat other group’s choice)

  2. Circumference & Area of Circles March 6th, 2014

  3. Behavior • Sit up straight • Track the speaker • Ask and answer • Respect others • Voice levels • Clapping

  4. QUIZ Tomorrow Be prepared!

  5. Objectives: You will be able to • Be a STAR • Know the formula for finding circumference and area of a circle • Use them Agenda • Do Now • Behavior • Circles! • Closure Homework: • Textbook P 589 #5-11 • Make a review graphic organizer

  6. Circles! What exactly is a circle? A circle is all the points in the plane whose distance from a central point is the same.

  7. Key terms • Radius (r): the distance between the central point to any point on the circle (the edge) • Diameter (d): a line that passes through the center of a circle • Circumference (C): distance around the edge of a circle

  8. Guess what this is It is a constant number. It is an irrational number and goes on forever! It is the ratio between the circumference and diameter of a circle. 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282306647093844609550582231725359408128481…

  9. Formula • Circumference • C = 2 x ∏ x r (radius) = ∏ x d • Area • A = ∏ x r2

  10. Let’s try it! C = 2 x ∏ x r = ∏ x d

  11. AreaA = ∏ x r2

  12. Closure What is a circle? What is the circumference of a circle? How do you find the area of a circle?

  13. Graphic Organizer

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