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What is the Surface area of a glass bead that has the diameter of 11m? Express your answer to the nearest square mm.

A glass bead would be a sphere. So the formula for that is-->

SA = 4ðr^2
= 4ð(5.5^2)
= 380mm^2

  • math -

    is the diameter 11mm? Then

    radius= .0055m
    radius^2= 5.5E-3 ^ 2=30.25 E-6m

    4PIr^2= about 12*30.25E-6 m

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