Geometry Calculators
Rectangle Calculator
Instant properties of any rectangle from length and width.
Area
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Perimeter
0
Diagonal Length
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Rectangle Properties & Formulas
A rectangle is a quadrilateral with four right angles. Opposite sides are parallel and equal in length.
Area (A) = Length × Width
Perimeter (P) = 2 × (Length + Width)
Diagonal (d) = √(Length² + Width²)
The diagonal formula is derived directly from the Pythagorean theorem, as a diagonal splits a rectangle into two identical right-angled triangles!