Question

calcule as medidas de x e y ​

Answer 1

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$\sf x^2=5^2+12^2\\\sf x^2=25+144\\\sf x^2=169\\\sf x=\sqrt{169}\\\sf x=13\checkmark\\\sf y^2+x^2=(3\sqrt{21})^2\\\sf y^2+169=189\\\sf y^2=189-169\\\sf y^2=20\\\sf y=\sqrt{20}\\\sf y=\sqrt{4\cdot5}\\\sf y=2\sqrt{5}\checkmark$