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21. One of the legs of a right triangle measures 18 cm and
its hypotenuse measures 19 cm. Find the measure of the
other leg. If necessary, round to the nearest tenth.


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Réponse : For this question you have to use Pythagoras's theorem.

whether, ABC a triangle right in A, according to the Pythagorean theorem, we write:

BC²=AC²+AB²

19²= 18²+AB²

AB²= 19²-18²

      =361-324

      =37

AB=R(37)

    ~=6.1

So, the other legs measures nearly 6.1

I hope you can understand what I'm saying.

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