基础几何题：三角形度数
问题：请求出下图中？的角度。
解：
$$\because a=360^{\circ}-180^{\circ}-60^{\circ}=120^{\circ}$$
$$\because b=\frac{180^{\circ}-a}{2}=30^{\circ}$$
$$\therefore ?=180^{\circ}-b=150^{\circ}$$
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