在四边形ABCD中,角A等于角C等于90度,BE平分角ABC,DF平分角ADC,说明BE平行DF

在四边形ABCD中,角A等于角C等于90度,BE平分角ABC,DF平分角ADC,说明BE平行DF
在四边形ABCD中,角A等于角C等于90度,BE平分角ABC,DF平分角ADC,说明BE平行DF

在四边形ABCD中,角A等于角C等于90度,BE平分角ABC,DF平分角ADC,说明BE平行DF
如图角1=角2,角3=角4\x0d因为A等于角C等于90度\x0d所以角1+角2+角3+角4=180度\x0d所以角2+角4=90度\x0d因为角C等于90度\x0d所以角4+角5=90度\x0d所以角2=角5\x0d所以BE与FD平行么 \x0d图片\x0d

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因为角A 等于角C等于90度
所以角ADC加角ABC等于180度
因为BE平分∠ABC，DF平分∠ADC
所以角2加角3等于90度
因为角A等于90读
所以角AFD等于角ABE等于角2
所以BE//DF

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