it means decimeter in math...
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2000 dm is the same as 200 m. 2000 dm is longer than 20 m, not bigger.
mm means millimeters in measurements
A congruent angle can also mean equal angle. So there is no set measurement of a congruent angle. Just the same as the angle it is equal to.
If you mean a rectangle: choose any positive number for the first measurement. Then divide 90 by this number to get the second measurement.
700