单选题 适中0.65 引用3 组卷728
已知△ABC的∠A=60°,剪去∠A后得到一个四边形,则∠1+∠2的度数为( )
![](https://img.xkw.com/dksih/QBM/2018/9/27/2041508338270208/2043395277725696/STEM/dc6a4d57e2034bd89dd9ff0bdac004fd.png?resizew=262)
![](https://img.xkw.com/dksih/QBM/2018/9/27/2041508338270208/2043395277725696/STEM/dc6a4d57e2034bd89dd9ff0bdac004fd.png?resizew=262)
A.270° | B.240° | C.200° | D.180° |
18-19八年级上·湖北·阶段练习
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如图,∠AOB=20°,M,N分别是边OA,OB上的定点,P,Q分别是边OB,OA上的动点,记∠OPM=α,∠OQN=β,当MP+PQ+QN最小时,则关于α,β的数量关系正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/11/3/2325787960197120/2326166243753984/STEM/e428cfea8b544328a527bc6fa0abba44.png?resizew=221)
![](https://img.xkw.com/dksih/QBM/2019/11/3/2325787960197120/2326166243753984/STEM/e428cfea8b544328a527bc6fa0abba44.png?resizew=221)
A.β﹣α=30° | B.β﹣α=40° | C.β+α=180° | D.β+α=200° |
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