2. Mark Arcaro Geometry High School

3.  After Today’s Lesson I Can… ◦ Identify the different parts of a circle. ◦ Solve for the circumference of a circle. ◦ Solve for the area of a circle.

4. Radius (r ) Diameter (d ) Circumference (C ) The radius is equal to half of the diameter. So the radius can be found by r = d/2

5. The circumference of the circle is 9.42 centimeters. 3 cm

6. 4 cm The area of the circle is 50.27 centimeters squared.

7. 3.78 cm15.71 cm 7.85 cm9.34 cm 5 cm d = 5

8. Move on to Question #2

9. Retry Question

10. 28.27 cm 18.85 cm 113.10 cm9.42 cm 6 cm d = 6 cm

11. Retry Question

12. DONE!

13.  Math Goodies ◦ http://www.mathgoodies.com/lessons/toc_vol2.html http://www.mathgoodies.com/lessons/toc_vol2.html