趣味数学题05 | 三角形求角度数问题 - 趣味数学题

请问下图中$y+x=?$

解：

$$\begin{align}&\because a=90^\circ-40^\circ=50^\circ \\ &\therefore y=180^\circ-a=130^\circ \\ &\because b=90^\circ-a=40^\circ \\ &\therefore x=180^\circ-b=140^\circ \\ &\therefore y+x=270^\circ \end{align}$$

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趣味数学题05 | 三角形求角度数问题