Explicación paso a paso:
4.
[tex]\alpha + 90 + 30 = 180 \\\alpha + 120 = 180 \\\alpha = 180 - 120\\\alpha = 60[/tex]
3.
[tex]\alpha +\alpha +40 = 180 \\2\alpha + 40 = 180 \\\alpha = \frac{180-40}{2} \\\alpha = \frac{140}{2} \\\alpha = 70[/tex]
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Verified answer
Explicación paso a paso:
4.
[tex]\alpha + 90 + 30 = 180 \\\alpha + 120 = 180 \\\alpha = 180 - 120\\\alpha = 60[/tex]
3.
[tex]\alpha +\alpha +40 = 180 \\2\alpha + 40 = 180 \\\alpha = \frac{180-40}{2} \\\alpha = \frac{140}{2} \\\alpha = 70[/tex]