Explanation of how to measure the diameter of a marble using a millimeter scale and set squares.
To measure the diameter of a marble using a millimeter scale and two set squares, first place the marble on a flat surface. Then, position the set squares around the marble in a way that the edges just touch the sides of the marble. Next, using the millimeter scale, measure the distance between the two set squares, which will give you the diameter of the marble.
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