Enter two legs to find the hypotenuse, or one leg and the hypotenuse to find the other leg. Nothing leaves your browser.
a² + b² = c², where c is the hypotenuse (the side opposite the right angle). The hypotenuse is √(a² + b²); a missing leg is √(c² − a²).
In a right triangle, the square of the hypotenuse equals the sum of the squares of the other two sides: a² + b² = c².
Square both legs, add them, and take the square root. Legs 3 and 4 give √25 = 5.
Subtract the square of the known leg from the square of the hypotenuse, then take the square root.
Only for right triangles, those with a 90 degree angle.
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