1 / 19

Splash Screen

Splash Screen. Five-Minute Check (over Lesson 11–3) Main Idea and Vocabulary Key Concept: Area of a Circle Example 1: Find the Area of a Circle Example 2: Real-World Example Example 3: Test Example. Lesson Menu. Find the areas of circles. sector. Main Idea/Vocabulary. KC 1. π. ×.

adrian-porter
Télécharger la présentation

Splash Screen

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. Splash Screen

  2. Five-Minute Check (over Lesson 11–3) Main Idea and Vocabulary Key Concept: Area of a Circle Example 1: Find the Area of a Circle Example 2: Real-World Example Example 3: Test Example Lesson Menu

  3. Find the areas of circles. • sector Main Idea/Vocabulary

  4. KC 1

  5. π × x2 ENTER 4 50.26548246 Find the Area of a Circle Find the area of the circle shown here. A = πr2 Area of a circle A = π●42 Replace r with 4. Answer: about 50.3 cm2 Example 1

  6. A B C D Find the area of the circle shown here. A. approximately 32.97 ft2 B. approximately 65.9 ft2 C. approximately 121.3 ft2 D. approximately 346.4 ft2 Example 1

  7. KOIFind the area of the koi pond shown. The diameter of the koi pond is 3.6 m. Therefore, the radius is 1.8 m. A = πr2 Area of a circle A = π(1.8)2 Replace r with 1.8. A≈10.2 Multiply. Answer: about 10.2 m2 Example 2

  8. A B C D COINSFind the area of a nickel whose diameter is 2.1 centimeters. A. approximately 2.5 cm2 B. approximately 3.3 cm2 C. approximately 3.5 cm2 D. approximately 4.5 cm2 Example 2

  9. Mr. McGowan made an apple pie with a diameter of 10 inches. He cut the pie into 6 equal slices. Find the approximate area of each slice. A 3 in2 B 13 in2 C 16 in2 D 52 in2 Read the ItemYou can use the diameter to find the total area of the pie and then divide that result by 6 to find the area of each slice. Solve the ItemFind the area of the whole pie. Example 3

  10. A = πr2 Area of a circle A = π(5)2 Replace r with 5. A≈78 Multiply. Find the area of one slice: 78 ÷ 6 = 13 Answer: B Example 3

  11. A B C D MERRY-GO-ROUND The floor of a merry-go-round at the amusement park has a diameter of 40 feet. The floor is divided evenly into eight sections, each having a different color. Find the approximate area of each section of the floor. A. 157 ft2 B. 225 ft2 C. 264 ft2 D. 312 ft2 Example 3

  12. End of the Lesson End of the Lesson

  13. Five-Minute Check (over Lesson 11–3) Image Bank Math Tools Area of Trapezoids Drawing 3-D Figures Area of Polygons Resources

  14. A B C D (over Lesson 11-3) Find the circumference of the circle. Use 3.14 for . Round to the nearest tenth if necessary. radius = 5 ft A. 15.7 ft B. 31.4 ft C. 78.5 ft D. 3.14 ft Five Minute Check 1

  15. A B C D (over Lesson 11-3) Find the circumference of the circle. Use 3.14 for . Round to the nearest tenth if necessary. diameter = 11.2 in. A. 35.2 in. B. 17.6 in. C. 70.3 in. D. 7.0 in. Five Minute Check 2

  16. A B C D (over Lesson 11-3) Find the diameter of the circle. Use 3.14 for . Round to the nearest tenth if necessary. C = 30 ft, diameter = ___ ft A. 9.5 B. 19.1 C. 9.6 D. 4.8 Five Minute Check 3

  17. A B C D (over Lesson 11-3) Find the diameter of the circle. Use 3.14 for . Round to the nearest tenth if necessary. C = 96 cm, diameter = ___ cm A. 24 B. 15.3 C. 3.0 D. 30.6 Five Minute Check 4

  18. A B C D (over Lesson 11-3) A coffee can has a circumference of 216 mm. Which equation could be used to find the diameter of the can in inches? A. 216 = d B.C = × 108 C. 108 = × d D.C = × 14.7 Five Minute Check 5

  19. End of Custom Shows

More Related