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Question Number 12096 by sin (x) last updated on 13/Apr/17

Answered by ajfour last updated on 13/Apr/17

Commented by ajfour last updated on 13/Apr/17

$$AsCD=AE$$$$EM=\frac{1}{2}CD=\frac{1}{2}AE$$$$\sin \alpha =\frac{EM}{AE}=\frac{1}{2}$$$$\Rightarrow \mathit{\alpha }=30°.$$

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