Calculate rectangle area, perimeter, diagonal with step-by-step explanations.
Enter Rectangle Data
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Step-by-Step Solution
Rectangle Formulas
Area
A = length × width
Product of length and width
Perimeter
P = 2(length + width)
Twice the sum of length and width
Diagonal
d = √(length² + width²)
Using Pythagorean theorem
Length from Area
length = A/width
If area and width are known
Quick Examples
About Rectangle Calculations
What is a Rectangle?
A rectangle is a quadrilateral with four right angles and opposite sides that are equal and parallel. It is one of the most common shapes in geometry and everyday life.
Key Properties
Four right angles: All interior angles are 90 degrees
Opposite sides equal: Length and width are the same on opposite sides
Parallel sides: Opposite sides are parallel
Diagonals equal: Both diagonals have the same length