WT-021
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CALCULATORS / LOCAL UTILITY
Pythagorean Theorem Calculator
Solve a missing side of a right triangle with a² + b² = c² and show the work.
GEOMETRY
LOCAL
NO DATA SENT
RIGHT TRIANGLE BENCH
A² + B² = C²
SIDES
ENTER ANY TWO SIDES
Leave one side blank. As soon as two valid side lengths are entered, the missing side is calculated automatically.
STEPS
SUBSTITUTE / SQUARE / ROOT
READY
Enter any two sides and the missing side will be solved automatically.
LOCAL TOOL: Triangle calculations stay entirely in your browser.
FIELD NOTE / 021
Use a² + b² = c² to solve a right triangle.
The Pythagorean theorem applies to right triangles. The two legs are a and b, while c is the hypotenuse—the side opposite the right angle and the longest side of the triangle.
Enter any two known sides and leave the third blank. For example, if a = 3 and b = 4, the calculator automatically finds c = 5. If you know a leg and the hypotenuse instead, it subtracts the known leg's square from c² before taking the square root.