Use this rectangle diagonal calculator to quickly determine the diagonal of a rectangle when the length and width are known. This tool helps you easily calculate rectangle diagonal using the correct formula.
d = rectangle diagonal
l = length
w = width
The rectangle diagonal formula is derived from the Pythagorean theorem because the diagonal forms a right triangle inside the rectangle.
| Length | Width | Diagonal |
|---|---|---|
| 3 | 4 | 5 |
| 5 | 12 | 13 |
| 8 | 6 | 10 |
| 10 | 10 | 14.142136 |
| 20 | 15 | 25 |
If you want to understand how to find diagonal of rectangle manually, follow these steps.
1. Square the rectangle length.
2. Square the rectangle width.
3. Add both values together.
4. Take the square root of the result.
Using the rectangle diagonal formula, you can easily calculate rectangle diagonal with basic mathematics.
This rectangle diagonal calculator automatically calculates the correct result using the rectangle diagonal formula. Simply enter the rectangle length and width and the tool performs the calculation instantly.
The calculator displays accurate results with up to six decimal places and works on desktop and mobile devices. It is useful for students, engineers, architects, and anyone learning how to find diagonal of rectangle.
• The diagonals of a rectangle are always equal in length.
• The diagonal divides a rectangle into two identical right triangles.
• The Pythagorean theorem is used to calculate the diagonal.
• A square is a special rectangle where the diagonal formula still applies.
• Rectangle diagonals are used in construction, engineering, and design layouts.