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Triangle area
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Perimeter
Frequently Asked Questions
What is the Pythagorean theorem?
For a right-angled triangle, a² + b² = c², where a and b are the two legs and c is the hypotenuse (the side opposite the right angle). It lets you find any one side from the other two.
Can I find a leg instead of the hypotenuse?
Yes. Rearranging gives a = √(c² − b²). Switch the “Solve for” option to enter one leg and the hypotenuse; the hypotenuse must be longer than the known leg.
Use a² + b² = c² to find a missing side of a right triangle, plus its area and perimeter.