You use a ruler or similar object that is marked with centimeters. If your ruler only has inches, measure the inches, then multiply with 2.54 to get centimeters.
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centimeters
42 centimeters squared.
There are 30.48 centimeters in a foot.Divide 220 by 30.48 to find that 220 centimeters = 7.22 feet
5 x 12 = 60 sq. cm
The frame is 14 cm wide