△ABC、角C=90度AC=AE\BC=BF.求角ECF

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△ABC、角C=90度AC=AE\BC=BF.求角ECF△ABC、角C=90度AC=AE\BC=BF.求角ECF△ABC、角C=90度AC=AE\BC=BF.求角ECF你要说清楚E和F点在斜边上.EC

△ABC、角C=90度AC=AE\BC=BF.求角ECF
△ABC、角C=90度AC=AE\BC=BF.求角ECF

△ABC、角C=90度AC=AE\BC=BF.求角ECF
你要说清楚E和F点在斜边上.ECF=ACE+BCF-90=FEC+EFC-90=(180-ECF)-90=90-ECF,2ECF=90,ECF=45(度)