1. Surface Area
of Spheres

2. Radius of a Sphere r

3. If you cut a sphere right down the middle you would create two congruent halves called HEMISPHERES.
You can think of the globe. The equator cuts the earth into the northern and southern hemisphere.

4. Surface Area of a Sphere

5. Surface Area of a Sphere
(round to the nearest hundredths)
8 in

6. Surface Area of a Sphere
(round to the nearest hundredths)
10 cm

7. The circumference of a great circle of a sphere is 25 inches
The circumference of a great circle of a sphere is 25 inches. Find the surface area of the sphere. (Round to the nearest tenths.)
25 in

8. Surface Area of a Sphere
A spherical balloon has an initial radius of 5 in. When more air is added, the radius becomes 10 in. Explain how the S.A. changes as the radius changes.
5 in
10 in

9. Find the radius
? in

10. Find the diameter
? cm