题目内容

已知:如图,AB⊥CD,垂足为O,EF经过点O,∠2=4∠1,

求∠2,∠3,∠BOE的度数(12分)
解:∵AB⊥CD
∴∠COB=900
                                                                                                       ∵∠COB=∠1+∠2,∠2=4∠1
∴∠1=180  ∠2=720
                                                                                                           ∴∠3=∠1=180
             ∠BOE=180°—∠1=162°
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