the diameter of the sun is about 400 times that of the moon, and it out-masses the moon by about 27 million times, they are both approximately the same apparent size in our sky.
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Callisto
Either pi times the diameter or pi times twice the radius (which is the diameter)
the width of the cylinder
The diameter of a circle represent the distance across it when divided in half. 1 millimeter equals .04 inches (rounded to one significant figure). Therefore 12 mm equals .05 inches.
Yes it is, where r is the radius