Pythagorean Theorem Calculator: Find Missing Side, Area & Perimeter

Use the calculator to enter any two right-triangle sides, choose units, set decimal precision, and press “Calculate.” The script applies $$a^{2}+b^{2}=c^{2}$$ to output the missing side, area and perimeter within milliseconds. Right-triangle problems make up about 30 % of SAT geometry questions (College Board, 2022).