Question

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

Answer 1

如图角1=角2，角3=角4 因为A等于角C等于90度 所以角1+角2+角3+角4=180度 所以角2+角4=90度 因为角C等于90度 所以角4+角5=90度 所以角2=角5 所以BE与FD平行么 图片

要使打不开图片就去参考资料里看

Answer 2

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

Answer 3

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Answer 4

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