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Circumference of a Circle

Circumference of a Circle. Definitions. Find the definitions for the following words. Write the definitions below and include a picture to illustrate the term. Pi . Diameter . Radius. Circumference. Definition. Illustration. Time for pi?.

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Circumference of a Circle

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  1. Circumference of a Circle

  2. Definitions Find the definitions for the following words. Write the definitions below and include a picture to illustrate the term. Pi Diameter Radius Circumference Definition Illustration

  3. Time for pi? If you measure the distance around a circle (circumference) and divide it by the distance across the circle through the center (diameter), you will always come close to an approximate value of 3.14159265358979323846. We use the Greek letter (pronounced pi) to represent this value. The number goes on forever. However, for our calculations, we will round pi to 3.14. = circumference diameter

  4. Diameter The distance across a circle through the center is called the diameter. When given the diameter of a circle, you can find the circumference by using a simple formula. Diameter D Circumference = 12 cm 22.6 cm 18 cm

  5. Radius A straight line from the center of a circle to the circumference is a called a radius. When given the radius of a circle, you can find the diameter by using a simple formula. . radius Diameter = 2r . . . 7 cm 2.2 cm 4 cm

  6. D Circumference = Summary is the ratio of the circumference of a circle to the diameter. It's approximate value is 3.14. = Circumference Diameter The diameter of a circle is twice the radius. D = 2r Given the diameter or radius of a circle, you are able to find the circumference. Given the circumference of a circle, you are able to find the diameter and radius. D = Circumference

  7. Circumference Terms that indicate circumference • Revolution • Rotation • Equator • Orbit

  8. The moon has a diameter of 4675 miles • A satellite orbits 13 miles above the moon. • What is the distance the satellite covers in one orbit? Orbit = circumference C = π d 13 mi What is the diameter of the orbit? 4675 mi

  9. d = Moon diameter + satellite distance above + satellite distance above 4675 + 13 + 13 d = 4701 mi Orbit = circumference = π d Orbit = π (4701) = 4701 π miles

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