Sorry bobpursely, but may I know what the E stands for in your formula?
What is the Surface area of a glass bead that has the diameter of 11m? Express your answer to the nearest square mm.
radius= .0055m
radius^2= 5.5E-3 ^ 2=30.25 E-6m
4PIr^2= about 12*30.25E-6 m
E means 10^
E2 means 10^2 or 100
e-6 means .000001
