Question

Los 2 últimos ayuda please

Answer 1

9)

$2 β + 90 + 40 = 180 \\ 2β = 180 - 130 \\β = \frac{50}{2} \\ β = 25$

10)

$2α + α + α + α + 90 = 360 \\ 5α = 360 - 90 \\ α = \frac{270}{5} \\ α = 54$