2. Mission 7 Mission for 7: Mission for 7: To successfully find the surface area of a sphere. Vocabulary: Vocabulary: surface area, sphere Formula: Formula: A = 4  r 2

3. Surface area Review Recall that surface area is the measure of the total surface of a 3-dimensional shape. For example, if you were hired to paint golf balls green, you would be painting the surface of the golf ball. The measure of the area that you painted is surface area.

4. Formula for a Sphere The formula for the surface area of a sphere is where SA is the surface area and r is the radius of the sphere.

5. This is how we do it! Find the surface area of a beach ball with radius of 50 cm. The formula for surface area of a sphere (beach ball) is : SA = 4  r 2 = 4  (50) 2 Therefore, the surface area is 31415.7 cm 2

6. Mi Problem es su Problem What is the radius of a bowling ball with a surface area of 225 cm 2 ?

7. Right On! Wow... And I thought I had all the answers! I guess you’re just a pro now!

8. Don’t look in the newspaper for the answer. Just click on Muddler.

9. Here is your Answer... SA = 4  r 2 225 = 4  r 2 17.9 = r 2 4.23 = r

10. Looks like we made it!

11. Click on Box Muddler if you love Geometry!

12. Exit! I hope you’ve enjoyed the show.