10.
如图,△ABC内接于⊙O,CD是⊙O的直径,∠A=35°,则∠BCD的度数是( )
| A. | 55° | B. | 65° | C. | 70° | D. | 75° |
5.
如图,将等腰直角三角形沿虚线裁去顶角后,∠1+∠2=( )
| A. | 225° | B. | 235° | C. | 270° | D. | 300° |
1.
如图,△BAC的外角∠CAE为120°,∠C=80°,则∠B为( )
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| A. | 60° | B. | 40° | C. | 30° | D. | 45° |