Question

calcule a medida da diagonal de um retangulo de dimensoes 12m e 9cm

Answer 1

$\large\boxed{\begin{array}{l}\underline{\sf Observe\,a\,figura\,que\,eu\,anexei}\\\rm d^2=12^2+9^2\\\rm d^2=144+81\\\rm d^2=225\\\rm d=\sqrt{225}\\\rm d=15\,cm\end{array}}$