Question

已知：如圖，AB⊥CD，垂足為O，EF經(jīng)過(guò)點(diǎn)O，∠２＝４∠１，

求∠２，∠３，∠ＢＯＥ的度數(shù)（12分）

Answer 1

解：∵AB⊥CD
∴∠COB=90⁰
                                                                                                       ∵∠COB=∠1+∠2，∠２＝４∠１
∴∠1=18⁰  ∠２＝72⁰
                                                                                                           ∴∠3=∠1=18⁰
             ∠ＢＯＥ=180°—∠1=162°

略