1 / 18

Area and Circumference of Circles

Area and Circumference of Circles. Radius: ½ the diameter R=(1/2)d. Diameter: The distance across a circle through its center. D=2r. Example. 1. Find the Radius of the circle below. A.) 4cm . B .) 16cm . 16cm. C.) 32cm. D .) 8cm . R=(1/2)d. Example. 2 .

ashton
Download Presentation

Area and Circumference of Circles

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. Area and Circumference of Circles

  2. Radius: ½ the diameter R=(1/2)d Diameter: The distance across a circle through its center. D=2r

  3. Example 1. Find the Radius of the circle below A.) 4cm B.) 16cm 16cm C.) 32cm D.) 8cm R=(1/2)d

  4. Example 2. Find the Diameter of the circle below A.) 18in B.) 9in 9in C.) 81in D.) 324in D=2r

  5. Area: The measure of square units within the circle. The formula to calculate the area is: A=πr² For simplicity, we use  π=3.14

  6. Example 3. Find the Area for the following circle: A.) 14 ft² B.) 153.86 ft² 7ft C.) 21.98 ft D.) 49 ft A= πr²

  7. 4. Find the Area for the following circle: A.) 25.12 in B.) 16 in² 4 in C.) 50.34 in² D.) 8 in

  8. 5. Find the Area for the following circle: A.) 144 cm B.) 452.16 cm² 12 cm C.) 24 cm D.) 113.04 cm²

  9. Circumference: The distance around the circle. The formula for circumference of a circle is: C=πd For simplicity, we use  π=3.14

  10. Example 2: 6. Find the Circumference of the circle below A.) 18.84cm 3 cm B.) 9.42cm C.) 9cm D.) 28.26cm C= πd

  11. 7. Find the Circumference of the circle below A.) 20.41ft B.) 13ft 13 ft C.) 40.82ft D.) 169ft

  12. 8. Find the Circumference of the circle below A.) 31.4in 5in B.) 25in C.) 10in D.) 15.7in

  13. 9. Considering the Circumference of the circle is 56.52in what is the diameter? A.) 9in B.) 18in C=56.52in C.) 28.26in D.) 177.47in

  14. 10. Considering the Area of the circle is 50.24ft what is the radius? A.) 25.12ft² B.) 16ft² A=50.25ft C.) 100.5ft² D.) 4ft²

  15. r=4 r=4 11. A.) 16 B.) 12.56 C.) 50.24 D.) 25.12 Find the Area. 12. Find the Circumference. A.) 16 B.) 12.56 C.) 50.24 D.) 25.12

  16. r=6 r=6 13. Find the Area. A.) 36 B.) 37.68 C.) 18.84 D.) 113.04 14. Find the Circumference. A.) 36 B.) 37.68 C.) 18.84 D.) 113.04

  17. d=14 d=14 15. Find the Area. A.) 153.86 B.) 49 C.) 43.96 D.) 21.98 16. Find the Circumference. A.) 153.86 B.) 49 C.) 43.96 D.) 21.98

  18. d=18 d=18 17. Find the Area. A.) 254.34 B.) 81 C.) 28.26 D.) 56.52 18. Find the Circumference. A.) 254.34 B.) 81 C.) 28.26 D.) 56.52

More Related