From which law follows directly the validity of Pythagoras' theorem in the right triangle?

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c**2 = a**2 + b**2 - 2ab  cos  gamma $    $  $    $  gamma = 90** circ  Rightarrow  cos 90** circ =0 $    $ c**2 = a**2 + b**2 - 2ab  cos 90** circ $    $ c**2 = a**2 + b**2 $    $

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To solve this example are needed these knowledge from mathematics:

Pythagorean theorem is the base for the right triangle calculator. See also our trigonometric triangle calculator. Cosine rule uses trigonometric SAS triangle calculator.

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