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Properties of Rectangle Calculator

Online rectangle properties calculator. Enter length and width to find area, perimeter, and diagonal, with formulas—great for elementary geometry.

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Four right angles, equal bisecting diagonals; area=length×width
Length
Width

📖 Tutorial | Rectangle

1. Definition
A rectangle is a parallelogram with one right angle.
2. Formula & Notation
a, bLength and width
dDiagonal, √(a²+b²)
3. Properties & Laws
  • Four right angles;
  • Equal, bisecting diagonals;
  • Area=L×W;
  • 2 symmetry axes.
4. Steps
  1. Enter length a, width b;
  2. Click "Calculate";
  3. Or click "Load Example".
5. Worked Examples
Example: 6 × 4.
Solution: area 24, perimeter 20, diagonal ≈7.21.
6. Common Pitfalls
Equal diagonals are its hallmark;
Use Pythagoras for diagonal;
A square is a special rectangle.

❓ FAQ | Rectangle

Properties?
Right angles; equal, bisecting diagonals.
Area, perimeter?
L×W and 2(L+W).
6,4 diagonal?
≈7.21.
Diagonal?
√(L²+W²).
Special what?
Parallelogram.
How to test?
Right angle in parallelogram, or equal diagonals.