Resposta :
Então usamos a regra de 3:
[tex]\pi \rightarrow 180 \\ \frac{8 \pi}{5} \rightarrow x \\ x=\frac{180.\frac{8 \pi}{5}}{\pi} \\ x=288graus[/tex]
[tex]\pi \rightarrow 180 \\ \frac{2 \pi}{4}\rightarrow x \\ x=\frac{\frac{\pi}{2}.180}{\pi} \\ x=90graus[/tex]
[tex]\pi \rightarrow 180 \\ \frac{8 \pi}{5} \rightarrow x \\ x=\frac{180.\frac{8 \pi}{5}}{\pi} \\ x=288graus[/tex]
[tex]\pi \rightarrow 180 \\ \frac{2 \pi}{4}\rightarrow x \\ x=\frac{\frac{\pi}{2}.180}{\pi} \\ x=90graus[/tex]