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如图,求∠A+∠B+∠C+∠D+∠E的度数
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教案备课库《三角形的内角和与外角和》真题及答案
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1如图∠AOB=90°OM平分∠AOCON平分∠BOC求∠MON的度数2如果1中∠AOB=100°其
如图点A.O.E.在同一直线上∠AOB=40°∠COD=28°OD平分∠COE.1求∠COB的度数2
如图在△ABC中∠B.=30°∠C.=50°AE是∠BAC的平分线AD是高.1求∠BAE的度数2求∠
如图在△ABC中D.是BC边上的一点∠B.=50°∠BAD=30°将△ABD沿AD折叠得到△AEDA
如图在△ABC中∠ABC=80°∠ACB=50°1求∠A.的度数;2BP平分∠ABCCP平分∠ACB
如图所示∠α和∠β的度数满足方程组且CD∥EFAC⊥AE.1分别求∠α和∠β的度数2求证AB∥CD3
如图在△ABC中∠B.=30°∠C.=50°AE是∠BAC的平分线AD是高.1求∠BAE的度数2求∠
如图已知BC=CD=DE=EA∠A.=20°.1求∠DEC的度数2求∠B.的度数.
如图已知在△ABC中∠B.与∠C.的平分线交于点P..1当∠A.=70°时求∠BPC的度数2当∠A.
如图D.A.E.在一条直线上△ADC≌△AEB∠BAC=40°∠D.=45°求1∠B.的度数2∠BM
如图AB∥CD∠A=75°∠C=30°求∠E的度数.
如图四边形ABCD中∠B.=∠C.=90°∠CED=35°DE平分∠ADC.1求∠DAB的度数2若E
已知如图在△ABC∠BAC=80°AD⊥BC于D.AE平分∠DAC∠B.=60°求∠C.的度数求
如图在△ABC中∠ABC=80°∠ACB=50°1求∠A.的度数;2BP平分∠ABCCP平分∠ACB
如图∠1=∠B∠A=35°求∠2的度数.
如图已知△ABC是等边三角形点D.E.分别在边ABAC上且AD=CECD与BE相交于点O..1如图1
如图a∥bc∥d∠1=113°求∠2∠3的度数.
如图已知OM是∠AOC的角平分线ON是∠BOD的角平分线.1如图1若∠AOB=90°∠COD=30°
如图O.为直线AB上一点将直角三角板OCD的直角顶点放在点O.处.已知∠AOC的度数比∠BOD的度数
如图已知BC=CD=DE=EA∠A.=20°.1求∠DEC的度数2求∠B.的度数.
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