Sq inch = width X height (as in how many SI in a window glass)
UI = Width + height (this is a measurement often used for costing replacement window units instead of Sq")
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12 square centimeters 1 inch = 2.54 cm Therefore, 1 square inch = 2.54 x 2.54 cm2 = 6.4516 square centimeters.One square inch is equal to 2.54 x 2.54 = 6.4516 square centimetres.
If square has a 28-inch perimeter its area is: 49 square inches.
2.77 square feet.
The diagonal of a 101 inch square is about 142.84 inches.