配套习题- 三角形的外角 -【青果学院】

1/5单选题

难度：

1.如图，直线a、b被c所截，若a∥b，∠1=45°，∠2=65°，则∠3的度数为（　　）青果学院

A	110°
B	115°
C	120°
D	130°

正确答案：QQ==

6Kej562U77ya5qC55o2u5LiJ6KeS5b2i55qE5aSW6KeS5oCn6LSo77yMPGJyPuKItOKIoDEr4oigMj3iiKA0PTExMMKw77yMPGJyPuKItWHiiKVi77yMPGJyPuKItOKIoDM94oigND0xMTDCsO+8jDxicj7mlYXpgInvvJpB77yO

2/5单选题

难度：

2.如图，在△ABC中，CD是∠ACB的平分线，∠A=80°，∠ACB=60°，那么∠BDC=（　　）青果学院

A	80°
B	90°
C	100°
D	110°

正确答案：RA==

6Kej562U77ya4oi1Q0TmmK/iiKBBQ0LnmoTlubPliIbnur/vvIziiKBBQ0I9NjDCsO+8jDxicj7iiLTiiKBBQ0Q9MzDCsO+8iOW5s+WIhue6v+eahOWumuS5ie+8ie+8jDxicj7iiLXiiKBBPTgwwrDvvIw8YnI+4oi04oigQkRDPTExMMKw77yI5LiJ6KeS5b2i55qE5LiA5Liq5aSW6KeS562J5LqO5LiO5a6D5LiN55u46YK755qE5Lik5Liq5YaF6KeS55qE5ZKM77yJ77yOPGJyPuaVhemAiUTvvI4=

3/5单选题

难度：

3.已知如图，△ABC为直角三角形，∠C=90°，若沿图中虚线剪去∠C，则∠1+∠2等于（　　）青果学院

A	315°
B	270°
C	180°
D	135°

正确答案：Qg==

PGltZyB3aWR0aD0xMzQgaGVpZ2h0PTEwNyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzNCL0VCL3JCQUNKbFRDSVNyelpFZk1BQUFXbHM1MWtrNDkwMy5wbmciIGFsdD3pnZLmnpzlrabpmaI+PGJyPuino+etlO+8muKIteKIoDHjgIHiiKAy5piv4pazQ0RF55qE5aSW6KeS77yMIDxicj7iiLTiiKAxPeKIoDQr4oigQ++8jOKIoDI94oigMyviiKBD77yMPGJyPuWNs+KIoDEr4oigMj0y4oigQyvvvIjiiKAzK+KIoDTvvInvvIw8YnI+4oi14oigMyviiKA0PTE4MMKwLeKIoEM9OTDCsO+8jDxicj7iiLTiiKAxK+KIoDI9MsOXOTDCsCs5MMKwPTI3MMKw77yOPGJyPuaVhemAie+8mkLvvI4=

4/5单选题

难度：

4.如图，∠BDC=98°，∠C=38°，∠B=23°，∠A的度数是（　　）青果学院

A	61°
B	60°
C	37°
D	39°

正确答案：Qw==

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

5/5单选题

难度：

5.如图，点D，E在△ABC的边上，CD与BE相交于点F．则∠1，∠2，∠3，∠4应满足的关系是（　　）青果学院

A	∠1+∠4=∠2+∠3
B	∠1+∠2=∠3+∠4
C	∠1+∠2=∠4-∠3
D	∠2-∠1=∠3+∠4

正确答案：RA==

6Kej562U77ya4oi14oigQ0VG5piv4pazQUJF55qE5aSW6KeS77yMPGJyPuKItOKIoDMr4oigND3iiKBDRUbvvIw8YnI+4oi14oigMuaYr+KWs0NFRueahOWkluinku+8jDxicj7iiLTiiKAxK+KIoENFRj3iiKAy77yM5Y2z4oigMi3iiKAxPeKIoENFRu+8jDxicj7iiLTiiKAyLeKIoDE94oigMyviiKA077yOPGJyPuaVhemAiUTvvI4=