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Question Number 185283 by Mingma last updated on 19/Jan/23

Answered by HeferH last updated on 19/Jan/23

$$50°?$$

Commented by Mingma last updated on 20/Jan/23

Can you show your work? The answer is 50

Commented by HeferH last updated on 20/Jan/23

Commented by HeferH last updated on 20/Jan/23

$$△EAD\sim △BAC(byAngle;Angle)$$$$\frac{EA}{BA}=\frac{DA}{CA}\Rightarrow \frac{EA}{DA}=\frac{BA}{CA}$$$$△EAB\sim △DAC(bySide;Angle;Side)$$$$\mathrm{\angle }ECD=80°$$$$\therefore \alpha =50°$$

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