256 square inches
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256 square inches. You get that by multiplying 16 by 16.
21 x 21 = 441 square inches
There is no fixed number. It depends on the product (computer monitor, TV screen, digitial camera) and the model.
The perimeter of a square with 2 inch sides is 8 inches.
21 inches is the diagonal measure of the screen in a 21-inch TV.