1 / 14

DO NOW

Practice finding the circumference of circles using the formula C = 2πr or C = πd. Solve problems and round to the nearest tenth if necessary.

mtoner
Download Presentation

DO NOW

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. DO NOW Complete number 6 (Area and Perimeter) on sheet 6-8

  2. Chapter 6lesson 9 Circles and circumference Objective: Find the circumference of circles

  3. Show Brain Pop Video

  4. Vocabulary Circle: the set of all points in a plane that are the same distance from a given point called the center. center

  5. Vocabulary Radius: r The distance from the center to any point on a circle. Circumference: C The distance around the circle Diameter: d The distance across a circle through the center

  6. Pi 3.14159… Where has Pi come from?

  7. Pi: The ratio of the circumference of a circle to its diameter. The circumference is 3.14… times the diameter. d

  8. The circumference of a circle C = d or C = 2 r

  9. To solve each problem make sure you solve using the 4 steps! F: Formula P: Plug it in S: Solve A: Answer

  10. Lets try some C = d or C = 2 r 8 ft C = 2 x 3.14 x 8 C = 16 x 3.14 C = 50.24 C= 50.2 ft Find the circumference of each circle. Round to the nearest tenth if necessary.

  11. Lets try some Find the circumference of each circle. Round to the nearest tenth if necessary. C = d or C = 2 r 14 m C = 3.14 x 14 C = 43.96 C = 44 m

  12. Lets try some more!! Find the circumference of each circle. Leave your answer in terms of pi. C = d or C = 2 r C = 2 x x 11.7 C = 23.4 x C = 23.4 cm Radius = 11.7 cm

  13. Lets try some Find the circumference of each circle. Leave your answer in terms of pi. C = d or C = 2 r C = x 3.5 C = 3.5 yd diameter = 3 ½ yd

  14. Turn to page 276 in your textbooks Do numbers 11 and 12 ( solve out answer) And Numbers 13 and 15 (answer in terms of pi)

More Related