[tex]\alpha + 40 + 50 + 110 + 90 =360\\\\ \alpha + 290 = 360\\\\ \alpha =360 - 290\\\\\alpha=70[/tex]
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[tex]\alpha + 40 + 50 + 110 + 90 =360\\\\ \alpha + 290 = 360\\\\ \alpha =360 - 290\\\\\alpha=70[/tex]
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