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You find a tape measure and take the measurement across the door, then the length of it, then if necessary the thickness.
compare it with cm .....mm x 10 cm
76 millimetres is equal to 7.6 centimetres, or 2.99 inches.
This is not a valid conversion. Square mm is a measure of area. Cubic mm is a measure of volume.
To measure the mm of an item you would need to use a metric ruler. The metric ruler has cm and mm on it.