1 / 20

7th Grade

CIRCUMFERENCE. 7th Grade. The circumference of a circle is. The distance around a circle. Hint: Circumference remember circle around. First we must define some things about a circle. The radius is the distance from the center of a circle to any point on a circle.

Download Presentation

7th Grade

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. CIRCUMFERENCE 7th Grade

  2. The circumference of a circle is The distance around a circle Hint: Circumference remember circle around

  3. First we must define some things about a circle. The radius is the distance from the center of a circle to any point on a circle. Hint: I like to define it as halfway through!

  4. The diameter is the distance across a circle through the center.

  5. We use Pi as the measurement to help us find the circumference of a circle. Pi, not Pie!

  6. HINT: Pi =3.14

  7. Two formulas are used in finding the circumference of a circle. WHEN THE CIRCLE HAS A DIAMETER MEASUREMENT, USE THE FOLLOWING FORMULA. Circumference = d 4in. 3.14 x 4in. 12.6in.

  8. When the radius of a circle is given, the following formula should be used. Circumference = 2 r 2 x 3.14 x 5cm 31.4cm HINT: Always round your answers to the nearest tenth.

  9. NOW…Let’s have some fun. Tell me what formula would be used to solve the next five problems.

  10. 3in C = 2 x 3.14 x r

  11. 8ft C = 3.14 d

  12. 122mm C = 2 x 3.14 x d

  13. 17.5 cm C = 3.14 x d

  14. 122.5mm C = 2 x 3.14 x r

  15. Now that we have determined the correct formula for each, let’s work the problems.

  16. The answer is: 18.8in 3in C = 2 x 3.14 x r

  17. 8ft C = 3.14 d The answer is: 25.1ft

  18. 122mm C = 2 x 3.14 x d The answer is: 766.2mm

  19. 17.5 cm C = 3.14 x d The answer is: 55cm

  20. 122.5mm C = 2 x 3.14 x r The answer is: 76,930mm

More Related