Triangle Side Calculator
a
b
c
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Live triangle visualization
Result
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a² + b² = c²
What is a Triangle Side Calculator?
A Triangle Side Calculator helps you find the missing side of a right-angled triangle using the Pythagorean theorem. Enter any two sides (a, b, or c) and the calculator will instantly compute the third.
Pythagorean Formula
a² + b² = c²
Applies only to right-angled triangles
How the Calculator Works
- Find hypotenuse (c): c = √(a² + b²)
- Find base (a): a = √(c² − b²)
- Find height (b): b = √(c² − a²)
Examples
Example 1: Find Hypotenuse
a = 3, b = 4
c = √(3² + 4²) = √25 = 5
Example 2: Find Base
b = 4, c = 5
a = √(5² − 4²) = √9 = 3
Example 3: Find Height
a = 6, c = 10
b = √(10² − 6²) = √64 = 8
Important Rules
- Enter exactly two values
- All sides must be positive numbers
- Hypotenuse (c) must be the largest side
- Works only for right-angled triangles
FAQ on Triangle Side Calculator
What is the formula for triangle sides?
The formula is a² + b² = c² for right-angled triangles.
Can I calculate any triangle?
No, this calculator works only for right-angled triangles.
Which side is the hypotenuse?
The hypotenuse (c) is the longest side opposite the 90° angle.
How many values should I enter?
Enter exactly two values to calculate the third side.