Squares are the rectangles that have four equal sides. Calculate perimeter of a square, area of a square and diagonal of a square.

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Squares are the rectangles that have four equal sides. Calculate perimeter of a square, area of a square and diagonal of a square.

`Square Formula`

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Squares are the rectangles that have four equal sides. Calculate perimeter of a square, area of a square and diagonal of a square.

$a$, Symbol for Side;

Square, in geometry, a plane figure with four equal sides and four right (90°) angles. A square is a special kind of rectangle (an equilateral one) and a special kind of parallelogram (an equilateral and equiangular one). A square has four axes of symmetry, and its two finite diagonals (as with any rectangle) are equal. Bisection of a square by a diagonal results in two right triangles. If the length of the side of a square is s, then the area of the square is s^{2}, or “s squared.” From this relation is derived the algebraic use of the term square, which denotes the product that results from multiplying any algebraic expression by itself.

$\mathrm{4a}$

${a}^{2}$

$a\sqrt{2}$

^{Figure - 14.1} https://www.cut-the-knot.org/do_you_know/sqRtOf2.gif