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Question Number 180298 by mnjuly1970 last updated on 10/Nov/22

Answered by mr W last updated on 10/Nov/22

Commented by mr W last updated on 10/Nov/22

$$2\beta +2\gamma +120°=180°$$$$\Rightarrow \beta +\gamma =30°$$$$\alpha +60°+(90°-\beta )+(90°-\gamma )=360°$$$$\alpha -\beta -\gamma =120°$$$$\Rightarrow \alpha =120°+30°=150°✓$$

Commented by mnjuly1970 last updated on 10/Nov/22

$$thanksalotsirW$$

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