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Question Number 127382 by I want to learn more last updated on 29/Dec/20

Answered by mr W last updated on 29/Dec/20

Commented by mr W last updated on 29/Dec/20

$$CD=\frac{DE}{\sin 45°}$$$$BD=\frac{DE}{\sin 30°}$$$$\cos \alpha =\frac{CD}{BD}=\frac{\sin 30°}{\sin 45°}=\frac{\sqrt{2}}{2}$$$$\Rightarrow \alpha =45°=\mathrm{\angle }ABD$$

Commented by I want to learn more last updated on 29/Dec/20

$$\mathrm{Thanks}\mathrm{sir},\mathrm{i}\mathrm{appreciate}.$$

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