Question

Me ajudem urgenteeeeeee

Answer 1

No triângulo ACD podemos encontrar o valor de d por meio do Pitágoras:

$a^2=b^2+c^2\\d^2=40^2+80^2\\d^2=1\;600+6\;400\\d^2=8\;000\\d=\pm\sqrt{8\;000}\\d=\pm\sqrt{100\cdot16\cdot5}\\d=\pm(10\cdot4\sqrt{5})\\\boxed{d'=40\sqrt{5}\;m}\\d''=-40\sqrt{5}\;m\;(\~n\;conv\'em)$

Bons estudos!