[tex]\boxed{\begin{array}{l}\sf cos(60^\circ)=\dfrac{n}{8}\\\\\sf n=8cos(60^\circ)\\\sf n=8\cdot\dfrac{1}{2}=4\\\sf m=8\\\sf tg(30^\circ)=\dfrac{p}{4+8}\\\\\sf\dfrac{\sqrt{3}}{3}=\dfrac{p}{12}\\\\\sf3p=12\sqrt{3}\\\sf p=\dfrac{12\sqrt{3}}{3}\\\\\sf p=4\sqrt{3}\end{array}}[/tex]
