Question

ayuda es para mañana!!​

Answer 1

$\frac{\pi}{10} = 18 \\ \alpha + ( \alpha +\frac{\pi}{10} ) + ( \alpha + \frac{2\pi}{10} ) = 180 \\ 3 \alpha + 18 + 36 = 180 \\ 3 \alpha = 180 - 54 \\ 3 \alpha = 126 \\ \alpha = 42$