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Circles (3)
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Circles (3)

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  • 1. Wild about PI! Presenters: Tammy Bell -- Region VI LINCS Coordinator Tammy Cole -- Region VII LINCS Coordinator
  • 2. This is a circle.
  • 3. Radius This is the radius of a circle. It is a line segment starting from the center of the circle. The radius of this circle is four inches. 4 in.
  • 4. Diameter To find the length across the circle you would double the radius. 4 in. 4 in The line segment that forms across is called the diameter . DIAMETER 4 in + 4 in = 8 in
  • 5. Circumference To find the measurement all around the circle you would multiply the diameter by 3.14 or 3 for a good estimate!! Let’s Try!------------------->
  • 6. Measuring Around the Circle Remember the radius is 4 inches . Double it to find the diameter . 4 in + 4 in =8 in The best estimate of the length around the circle is 24 inches. 8 in x 3 in = 24 in 4 in 8 inches
  • 7. Measuring Circles Review Radius Diameter Circumference Measurement ALL around the circle.
  • 8. Find the diameter: 5 in . 3 in 7 in. 10 inches 6 inches 14 inches
  • 9. Find the Circumference Length around the circle. 5 in . 3 in 7 in. 30 inches 18 inches 42 inches
  • 10. . . Great Job!