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Question Number 49553 by ggny last updated on 07/Dec/18

Commented by mr W last updated on 07/Dec/18

$$\mathrm{\angle }1=\mathrm{\angle }3$$$$\mathrm{\angle }1+\mathrm{\angle }3=90°$$$$\Rightarrow 2\mathrm{\angle }1=90°$$$$\Rightarrow \mathrm{\angle }1=45°$$$$\mathrm{\angle }1+\mathrm{\angle }4=180°$$$$\Rightarrow \mathrm{\angle }4=180°-\mathrm{\angle }1=180°-45°=135°$$

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