AB∥CD,求证∠BED=∠D-∠B

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AB∥CD,求证∠BED=∠D-∠BAB∥CD,求证∠BED=∠D-∠BAB∥CD,求证∠BED=∠D-∠B因为AB∥CD,所以∠D=∠AFE,有因为∠AFE是△EBF的外角,所以∠E=∠AFB-∠B

AB∥CD,求证∠BED=∠D-∠B
AB∥CD,求证∠BED=∠D-∠B

AB∥CD,求证∠BED=∠D-∠B
因为AB∥CD,所以∠D=∠AFE,有因为∠AFE是△EBF的外角,所以∠E=∠AFB-∠B,等量代换,∠BED=∠AFB-∠B.