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

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

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

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

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

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

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