posted by Emma on .
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
is the diameter 11mm? Then
radius^2= 5.5E-3 ^ 2=30.25 E-6m
4PIr^2= about 12*30.25E-6 m