How to Calculate Rectangle
What is Rectangle?
A rectangle is a quadrilateral with four right angles. Opposite sides are equal and parallel. The square is a special rectangle where all four sides are equal.
Step-by-Step Guide
- 1Area = length × width
- 2Perimeter = 2 × (length + width)
- 3Diagonal = √(length² + width²)
Worked Examples
Input
w=8, h=5
Result
A=40, P=26, d=9.43
d=√(64+25)=√89
Input
w=12, h=9
Result
A=108, P=42, d=15
3-4-5 triple scaled ×3
Ready to calculate? Try the free Rectangle Calculator
Try it yourself →