April 18 ,2012 Aim: How do we find the Surface Area and Volume of a Sphere?

Formulas:
















Examples:



Example #1:


Find the surface area of a sphere with a radius of 6 cm

SA = 4 × pi × r²

SA = 4 × 3.14 × 6²

SA = 12.56 × 36

SA = 452.16

Surface area = 452.16 cm² 

http://www.basic-mathematics.com/surface-area-of-a-sphere.html

Example #1

Find V_sphere   if r = 2 inches

V_sphere = 4/3 × pi × r³

V_sphere = 4/3 × 3.14 × 2³

V_sphere = 4/3 × 3.14 × 8

V_sphere = 4/3 × 25.12

V_sphere = 4/3 × 25.12/1

V_sphere = (4 × 25.12)/(3 × 1)

V_sphere = (100.48)/3

V_sphere = 33.49 inches³
http://www.basic-mathematics.com/volume-of-a-sphere.html

Now you try it:


 1) A sphere has a radius of 6in. What is the volume of the figure?

 2) A sphere has a diameter of 20ft. What is the surface area of the figure and the radius?