1 in = 2.54 cm (exactly)
1 sq in = 1 in x 1 in
= 2.54 cm x 2.54 cm
= 6.4516 sq cm
⇒ 4 sq in = 4 x 6.4516 sq cm
= 25.8064 sq cm
≈ 25.81 sq cm
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An area 24 centimeters by 24 centimeters is 576 square centimeters.
It covers an area of 21.62 square centimeters. (1.85 inches by 1.81 inches, covering an area of 3.35 square inches)
There is no formula. Square inches measure area, and centimeters measure length. The two cannot be converted.
you cannot go from inches to centimeters squared. one inch = 2.54 cm you can go from inches squared to centimeters squared; in that case one inch square = (2.54 squared) cm = 6.45 cm squared
Oddly enough the perimeter is 16 centimeters.