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Splash Screen. Example 9-2b. Objective. Find the circumference of circles. Example 9-2b. Vocabulary. Circle. The set of all points in a plane that are the same distance from a given point called the center. Example 9-2b. Vocabulary. Center.

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  1. Splash Screen

  2. Example 9-2b Objective Find the circumference of circles

  3. Example 9-2b Vocabulary Circle The set of all points in a plane that are the same distance from a given point called the center

  4. Example 9-2b Vocabulary Center The given point from which all points on a circle or sphere are the same distance

  5. Example 9-2b Vocabulary Diameter The distance across a circle through its center

  6. Example 9-2b Vocabulary Radius The distance from the center to any point on a circle

  7. Example 9-2b Vocabulary Circumference The distance around a circle (perimeter) C = d or C =2r

  8. Lesson 9 Contents Example 1Find Circumference Example 2Find Circumference

  9. Example 9-1a PETSFind the circumference around the hamster’s running wheel shown below. Round to the nearest hundredth. Determine if the radius or diameter has been given C = 2  3.14  3 Write formula for circumference when radius is given Bring down C = 2  Replace  with 3.14 Replace r with 3 1/2

  10. Example 9-1a PETSFind the circumference around the hamster’s running wheel shown below. Round to the nearest hundredth. Multiply the factors C = 2  3.14  3 Note: If you use the  key on the calculator you will get a slightly different answer, but just remember to round to the nearest hundredth C = 18.84 C = 18.84 inches Add dimensional analysis Answer: C = 18.84 inches 1/2

  11. Example 9-1b SWIMMING POOLA new children’s swimming pool is being built at the local recreation center. The pool is circular in shape with a diameter of 18 feet. Find the circumference of the pool. Round to the nearest hundredth. Answer: 56.52 ft 1/2

  12. Example 9-2a Find the circumference of a circle with a diameter of 49 centimeters. Write the formula for circumference of a circle using diameter Bring down C = C = 3.14(49) Replace  with 3.14 C = 153.86 C = 153.86 cm Replace d with 49 Multiply Add dimensional analysis Answer: C = 153.86 cm 2/2

  13. Example 9-2b * Find the circumference of a circle with a radius of 35 feet. Answer: C = 219.80 ft 2/2

  14. End of Lesson 9 Assignment

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