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A speck of dust is about as long as 1 millimeter; a speck of dust can be found in all houses.
Many things can be smaller than a rock, such as a pebble, a grain of sand, or even a speck of dust.
You do a diameter circle!!
It is half of the diameter or radius = diameter/2
The cord of a circle that contains the center of that circle is a diameter of that circle.