Enter one known value and calculate the side, area, perimeter or diagonal of a square. You will get solution with stepbystep explanation.

To calculate missing value in square, based on one known value, you need to remember just three formulas.
F1:  $$ P = 4 \cdot a $$ 
a = side d = diagonal A = area P = perimeter 
F2:  $$ A = a^2 $$  
F3:  $$ d = a \cdot \sqrt{2} $$ 
The diagram at the right shows when to use each of these formulas.
If you are given diagonal d and you want to calculate side a, then you need to use formula which connects d and a.
If you are given area A and you want to calculate perimeter P then you need to make two steps to calculate perimeter. In first step you apply formula which connects area A and side a after that use formula which connects side a and perimeter P.
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