1. Math Humor What do you call the force on the surface of a balloon?
Sphere Pressure!!

2. LT 10.7: Know and apply the surface area and volume formulas for spheres

3. sphere The set f points in space that are a fixed distance from a given point called the center of a sphere.
center of a sphere The point inside a sphere that is the same distance from every point on the sphere.
radius of a sphere The distance from the center of a sphere to any point on the sphere.
hemisphere Half of a sphere.
great circle A circle on a sphere that divides the sphere into two hemispheres

5. Example 1
Find the volume of the sphere. Give your answer in terms of .
r = 12 4/3∏(12)3
2304 ∏ in3

6. Example 2 Find the diameter of a sphere with volume 36,000 cm3.
Diameter = 60 cm

8. Example 4
Find the surface area of the sphere.
SA = 4(25)2
2500cm2

9. Example 5
Find the volume of a sphere with surface area 324 in2. Give your answers in terms of .
324 = 4 r2
81 = r2
r = 9
V = 4/3 93
V = 972 in3