Posted by **Emma** on Thursday, September 30, 2010 at 9:06pm.

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

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