配套习题- 如何用角平分线的定义求角度 -【青果学院】

1/5单选题

难度：

1.

如图，OC是∠AOB的平分线，OD是∠AOC的平分线，且∠BOC=50°，则∠COD=（　　）

青果学院

A	50°
B	25°
C	100°
D	75°

正确答案：Qg==

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

2/5单选题

难度：

2.

如图所示，将一张长方形纸的一角斜折过去，使顶点A落在A′处，BC为折痕，如果BD为∠A′BE的平分线，则∠CBD=（　　）

青果学院

A	80°
B	90°
C	100°
D	70°

正确答案：Qg==

PGRpdj7op6PvvJrlm6DkuLrlsIbpobbngrlB5oqY5Y+g6JC95ZyoQeKAsuWkhO+8jOaJgOS7peKIoEFCQz3iiKBB4oCyQkPvvIw8YnI+5Y+I5Zug5Li6QkTkuLriiKBB4oCyQkXnmoTlubPliIbnur/vvIw8YnI+5omA5Lul4oigQeKAskJEPeKIoERCRe+8jDxicj7lm6DkuLriiKBBQkMr4oigQeKAskJDK+KIoEHigLJCRCviiKBEQkU9MTgwwrDvvIw8YnI+4oi0MuKIoEHigLJCQysy4oigQeKAskJEPTE4MMKw77yMPGJyPuaJgOS7peKIoENCRD3iiKBB4oCyQkMr4oCyQeKAskJEPTkwwrAuPGJyPuaVhemAiUIuPC9kaXY+

3/5单选题

难度：

3.

如图，OB是∠AOC的角平分线，OD是∠COE的角平分线，∠AOE=140°，∠COD=30°，则∠AOB=（　　）

青果学院

A	35°
B	40°
C	45°
D	50°

正确答案：Qg==

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

4/5单选题

难度：

4.在如图所示的2×2正方格中，连接AB，AC，AD，则∠1+∠2+∠3的和（　　）青果学院

A	必是直角
B	必是锐角
C	必是钝角
D	是钝角或锐角

正确答案：Qw==

PGRpdj7op6PvvJriiLUyw5cy5q2j5pa55qC85YWz5LqO57q/5q61QUPmiYDlnKjnmoTnm7Tnur/lr7nnp7DvvIw8YnI+4oi04oigMSviiKAzPTkwwrDvvIziiKAyPTQ1wrDvvIw8YnI+4oi04oigMSviiKAyK+KIoDM9OTDCsCs0NcKwPTEzNcKwLiA8YnI+5pWF6YCJQy4gPC9kaXY+

5/5单选题

难度：

5.

如图，OM、OP、ON分别是∠AOB、∠AOC和∠BOC的平分线，则下列各式能成立的是（　　）

青果学院

A	∠AOP＞∠MON
B	∠AOP=∠MON
C	∠AOP＜∠MON
D	∠AOP=∠BOC

正确答案：Qg==

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