1 / 8

The Circumference of a Circle

The Circumference of a Circle. How many times does the diameter fit around the circumference? Choose your number. 1. 1½. 2. 2½. 3. 3½. 4. d. diameter(d). In terms of the radius:. radius. C =?. Circumference (C).  =. 1. 2. C =2 r. 3. The Circumference of a Circle.

cade
Télécharger la présentation

The Circumference of a Circle

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. The Circumference of a Circle How many times does the diameter fit around the circumference? Choose your number. 1 1½ 2 2½ 3 3½ 4 d diameter(d) In terms of the radius: radius C =? Circumference (C)  = 1 2 C =2r 3

  2. The Circumference of a Circle It’s the same for all circles!

  3. The Circumference of a Circle Find the circumference of the following circles. 1 2 8 cm 9.5 cm C =d C =2r C =d C=  x 8 C = 25.1 cm (1 dp) C =d C=  x 9.5 C = 29.8 cm (1 dp)

  4. The Circumference of a Circle Find the circumference of the following circles. 4 3 3 mm C =d 2.1 m C =2r C =2r C = 2 x  x 3 C = 18.8 mm(1 dp) C = 2r C = 2 x  x 2.1 C = 13.2 m(1 dp)

  5. Find the circumference of the tyre and steering wheel. 7.5 cm 23 cm C =2r C = 2 x  x 7.5 C = 47.1 cm(1 dp) C =d C=  x 23 C = 72.3 cm (1 dp)

  6. The Circumference of a Circle Find the perimeter of the following semi-circles. 1 2 8 cm 9.5 cm C =d C =2r Perimeter =½d + d = ½ x  x 9.5 + 9.5 = 24.4 cm (1 dp) Perimeter =½d + d = ½ x  x 8 + 8 = 20.6 cm (1 dp)

  7. The Circumference of a Circle Find the perimeter of the ¼ and ¾ circles. 3 4 8.5 cm 6 cm C =d C =2r Perimeter =¾(2r) + 2r = ¾ x 2 x  x 8.5 + 2 x 8.5 = 57.1 cm (1 dp) Perimeter =¼(2r) + 2r = ¼ x 2 x  x 6 + 2 x 6 = 21.4 cm (1 dp)

  8. C =d C =2r The Circumference of a Circle Find the diameter/radius of the following circles. 5 6 C = 25 cm find the diameter. C = 30 cm find the radius. 2r = 30 r = 30/(2) r = 4.8 cm (1 dp) d = 25 d = 25/ d = 8.0 cm (1 dp)

More Related