如图,直线AB,CD相交于点O,OE平分∠BOD,OF平分∠COE,且∠1:∠2=1:4,求∠AOF的度数

来源:学生作业帮助网 编辑:作业帮 时间:2024/12/01 20:43:30
如图,直线AB,CD相交于点O,OE平分∠BOD,OF平分∠COE,且∠1:∠2=1:4,求∠AOF的度数
xP;N@Jz/w=Ypd!0") BTAP8 -*ۏT7o8˧1OQ>T`k22Xni C] Հbl+dFҭIK~3>JFDybcY2MKzu-@,*=5u,YʀtF+=a1iMk:m:>G goG'?;% }>ch޻5pbz:nǣ uGۨHS=ȩKHMҚ9P40Xi>\j#E

如图,直线AB,CD相交于点O,OE平分∠BOD,OF平分∠COE,且∠1:∠2=1:4,求∠AOF的度数
如图,直线AB,CD相交于点O,OE平分∠BOD,OF平分∠COE,且∠1:∠2=1:4,求∠AOF的度数

如图,直线AB,CD相交于点O,OE平分∠BOD,OF平分∠COE,且∠1:∠2=1:4,求∠AOF的度数
因为OE平分∠BOD,∠1=∠DOE,又因为,∠2:∠1=4:1,∠2+∠1+∠DOE=180
所以∠1=30,∠2=120=∠BOC
又OF平分∠COE,∠COE=150
∠EOF=75,∠BOF=45
∠AOF=180-∠BOF=135度

图在哪里

OE平分∠BOD ∠
∠BOD=2∠BOE
∠AOD:∠BOE=4:1
∠AOD:∠BOD=4:2=2:1
∠AOD+∠BOD=180°
∠AOD=120° ∠BOD=60°
∠BOE=∠DOE=30°
∠AOC=∠BOD=60° ∠AOD=∠BOC=120°
OF平分∠COE
∠COF=∠BOF=120°/2=60°
∠AOF=∠AOC+∠COF=60°+60°=120°

OE平分∠BOD
∠BOD=2∠BOE
∠AOD:∠BOE=4:1
∠AOD:∠BOD=4:2=2:1
∠AOD+∠BOD=180°
∠AOD=120° ∠BOD=60°
∠BOE=∠DOE=30°
∠AOC=∠BOD=60° ∠AOD=∠BOC=120°
OF平分∠COE
∠COF=∠BOF=120°/2=60°
∠AOF=∠AOC+∠COF=60°+60°=120°