Rectangle Area Calculator

Calculate the area of a rectangle with length 12 cm and width 8 cm:

Result: 96 cm²

1. Enter the length
2. Enter the width
3. Click "Calculate" to see the area

• Perimeter: $2(l + w)$
• Diagonal: $\\sqrt{l^2 + w^2}$
• Aspect ratio: $l:w$

• Opposite sides are equal and parallel
• All four angles are 90°
• Diagonals are equal and bisect each other
• A square is a special rectangle with equal sides

• Room and floor planning
• Land measurement
• Graphics and design
• Construction and carpentry
• Packaging design

How do I find the width from area and length? $w = \\frac{\\text{area}}{l}$

What is the diagonal of a 3×4 rectangle? $\\sqrt{3^2 + 4^2} = \\sqrt{25} = 5$

Is a square a rectangle? Yes, a square is a special type of rectangle where length equals width.

How many rectangles in a grid? In an m×n grid, there are $\\frac{m(m+1)}{2} \\times \\frac{n(n+1)}{2}$ rectangles.

Can I calculate the perimeter? Yes: P = 2 × (length + width).