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Do Now

Do Now. Take out a ruler and your calculator. Put your 6.1 worksheet on your desk to be stamped. Find the missing angle measure and any missing side lengths. The Circumference/ Diameter Ratio. Pi. Today’s Objectives.

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Do Now

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  1. Do Now • Take out a ruler and your calculator. • Put your 6.1 worksheet on your desk to be stamped. • Find the missing angle measure and any missing side lengths.

  2. The Circumference/ Diameter Ratio Pi

  3. Today’s Objectives • Calculate pi, the ratio of the circumference of a circle to its diameter. • Use the ratio pi to find missing distances. • Use problem solving skills.

  4. The distance around a polygon is called the perimeter • The distance around a circle is called the circumference Perimeter Circumference

  5. Which is greater? • Circumference of the canister? • Height of a tennis ball can?

  6. Let’s try it !!! The circumference of the canister is greater than the height of the canister or three tennis balls.

  7. The taste of pi • In this investigation you will find an approximate value for π by measuring circular objects and calculating the ratio of the circumference to the diameter. Lets see how close you come to the actual value of π.

  8. Practice The distance from the center of a Ferris wheel to one of the seats is approximately 90 ft, what is the distance traveled by a seated person, to the nearest foot, in one revolution?

  9. Partner challenge Show your work and explain your reasoning.

  10. Today’s Objectives • Calculate pi, the ratio of the circumference of a circle to its diameter. • Use the ratio pi to find missing distances. • Use problem solving skills.

  11. Exit Slip • If a circle has diameter of 13cm, what is its circumference? • If a circle has a circumference of 25cm, what is its radius?

  12. Honors Exit Slip (Period 5) Show your work and explain your reasoning.

  13. Honors Exit Slip (Period 2) • If a circle has a circumference of 25cm, what is its radius? • If the distance from the center of a Ferris wheel to one of the seats is approximately 45ft, what is the distance traveled by a seated person, to the nearest foot, in one revolution?

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