There is no equivalence.
An inch is a measure of length or distance in 1-dimensional space while 40 cm x 40 cm is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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12000
40 centimeters x 1 inch/2.54 centimeters = 15.75 inches
12 inches to the foot and 2.5 centimeters to the inch = (5 x 12) + 5 = 65 inches x 2.5 to get centimeters =162.5 centimeters
90 cm x 50 cm = 697.5014 sq. inches.
21 centimeters x 1 inch/2.54 centimeters = 8.267716535 inchesThere are 8.267716535 inches in 21 centimeters.