In Euclidean plane geometry, a rectangle is a quadrilateral with four right angles. It can also be defined as an equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 = 90°).

Sides of a rectangle: a,b

Diagonal: d

Radius of circumscribed circle: R

Perimeter: L

Area: A

- $d=√{a^2+b^2}$
- $R=d/2$
- $L=2(a+b)$
- $S=ab$

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