20 centimeters
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If you want to convert that to meters, divide the number by 100.
There are 10 millimeters in a centimeter.
20 x 25 millimeters is equal to 500 square millimeters. To convert this into square centimeters, you divide by 100 (since 1 centimeter is 10 millimeters). Therefore, 500 square millimeters is equal to 5 square centimeters.
The perimeter of a rhombus is equal to 4 times the length of one side, so for a rhombus-shaped highway sign with a 20-centimeter side, the perimeter would be 4 x 20 = 80 centimeters.
A 12 inch ruler can have millimetres on the other side and would be 300mm which is 30 cm. Only 20 cm is 8 inches. So - 200 cm is 10 times as much which is 80 inches which is 6 feet 8 inches.