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Teorema de Pitágoras
[tex]\large\boxed{\begin{array}{l}\sf a^2=b^2+c^2\\\sf a\longrightarrow hipotenusa\\\sf b\longrightarrow cateto~menor\\\sf c\longrightarrow cateto~maior\end{array}}[/tex]
[tex]\large\boxed{\begin{array}{l}\sf 17\longrightarrow hipotenusa\\\sf 8\longrightarrow cateto~menor\\\sf x\longrightarrow cateto~maior.\\\underline{\rm soluc_{\!\!,}\tilde ao\!:}\\\sf 17^2=8^2+x^2\\\sf x^2+64=289\\\sf x^2=289-64\\\sf x^2=225\\\sf x=\sqrt{225}\\\sf x=15~cm\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~c}}}}\end{array}}[/tex]
