Right triangle and Pythagoras calculator
Find the missing side and the angles of a right-angled triangle.
How this calculator works
Pythagoras: c² = a² + b². The angles come from the inverse tangent of opposite ÷ adjacent.
Worked example: sides of 3 and 4 give a hypotenuse of 5 and angles of 36.87° and 53.13°. Builders use 3-4-5 (or 0.6, 0.8 and 1.0 m) to check that a corner is square.
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