Question

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）

Answer

【解析】
∵AB⊥CD

                                                                    ∴∠COB=900

                                                                                                        ∵∠COB=∠1+∠2，∠２＝４∠１

                                                                      ∴∠1=180   ∠２＝720

                                                                                                            ∴∠3=∠1=180

              ∠ＢＯＥ=180°—∠1=162°

【解析】略