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A rectangle is a quadrangle, or a parallelogram, take the coulmn as an example where all four of its angles are right angles, or the diagonals have the same length. If l = w is true, then the rectangle is called a square, and then we have the following formulas: d = l√2, l = d÷√2 and S = l² = d²/2.Note: A measurement unit selection is optional
Rectangle Area : S = l × w
Angle: α = arctan(w ⁄ l)
Angle: β = arctan(l ⁄ w)
Perimeter: p =2 × (l+w)
Diagonal : d = √l²+w²
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