Question

初三数学已知梯形ABCD,AD平行BC,AB⊥BC,AD=1,AB=2,BC=3.已知梯形ABCD,AD∥BC只要2,3

Answer 1

问题2：如图2,在平行四边形PCQD中,设对角线PQ与DC相交于点G,则G是DC的中点,过点Q作QH⊥BC,交BC的延长线于H,∵AD∥BC,∴∠ADC＝∠DCH,即∠ADP＋∠PDG＝∠DCQ＋∠QCH,∵PD∥CQ,∴∠PDC＝∠DCQ,∴∠ADP＝∠QCH,又∵PD＝...