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# Rectangle calculator - diagonals, area, perimeter, circumference, sides

Rectangle calculator will help you calculate the diagonal of the rectangle, the side length, height, area of the rectangle.

## Rectangle area

$$\Large{S=a\cdot b}$$
Side length (a)

Side length (b)

Rectangle area (S)

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## Circumference / perimeter of a rectangle

$$\Large{S=2 \cdot (a+b)=2a+2b}$$
Side length (a)

Side length (b)

Perimeter of a rectangle (L)

## Diagonal of the rectangle

$$\Large{d=\sqrt{a^2 + b^2}}$$
Side length (a)

Side length (b)

Diagonal (d)

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