20题求解,初一数学,谢谢,急啊
2个回答
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∵OE平分∠BOD,
∴∠BOD=2∠BOE
=2×17∘18′
=34∘36′
又∵∠AOC+∠AOB+∠DOC+∠BOD
=360∘且OA⊥OB,OC⊥OD,即:∠AOB=∠DOC=90∘
∴∠AOC+∠BOD=180∘,
∠AOC=180∘−34∘36′
=145∘24′
∴∠BOD=2∠BOE
=2×17∘18′
=34∘36′
又∵∠AOC+∠AOB+∠DOC+∠BOD
=360∘且OA⊥OB,OC⊥OD,即:∠AOB=∠DOC=90∘
∴∠AOC+∠BOD=180∘,
∠AOC=180∘−34∘36′
=145∘24′
追答
∵OE平分∠BOD,
∴∠BOD=2∠BOE
=2×17°18′
=34°36′
又∵∠AOC+∠AOB+∠DOC+∠BOD
=360°
OA⊥OB,OC⊥OD,即:∠AOB=∠DOC=90°
∴∠AOC+∠BOD=180°,
∠AOC=180°−34°36′
=145°24′
∵OE平分∠BOD,
∴∠BOD=2∠BOE
=2×17°18′
=34°36′
又∵∠AOC+∠AOB+∠DOC+∠BOD=360°
OA⊥OB,OC⊥OD,即:∠AOB=∠DOC=90°
∴∠AOC+∠BOD=180°,
∠AOC=180°−34°36′
=145°24′
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