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Diagonal of a Rectangle
d = √(l² + b²)
Where: b = breadth (width), d = Diagonal, l = length
Use the same units for all lengths (e.g. all in cm); areas come out in cm², volumes in cm³.
Solved example
Given: b = 7, l = 5
Find: d (Diagonal)
- Formula: d = √(b² + l²)
- Substitute the values: d = √(5² + 7²)
- Result: d = 8.602325
Answer: d = 8.602325
Calculator
How to calculate Diagonal of a Rectangle
- Write down the formula: d = √(l² + b²).
- Note the known values (b, l).
- Substitute them and simplify to find d.
- Use the calculator above to solve for any letter.
Frequently asked questions
What is the formula for Diagonal of a Rectangle?
The formula is d = √(l² + b²), where b = breadth (width), d = Diagonal, l = length.
What is Diagonal of a Rectangle when b = 7, l = 5?
d = 8.602325. Substitute the values into d = √(l² + b²) and simplify.