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∠ABC=3∠ACB,AD平分∠BAC,BP⊥AD于P,若AB=10cm,AC=16cm,证BP长...
∠ABC=3∠ACB,AD平分∠BAC,BP⊥AD于P,若AB=10cm,AC=16cm,证BP长
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延长BP交AC于O,
∠PAB=∠PAO,∠APB=∠APO=RT∠,AP为公共边,
△PAB≌△PAO,AB=AO,BP=OP=OB/2,∠PBA=∠POA,
又∠ABC=3∠ACB,
∠BAC+∠ABC+∠ACB=2∠BAD+3∠ACB+∠ACB=2∠BAD+4∠或衡ACB=180°
∠BAD+2∠衫毁做ACB=90°
又∠PBA+∠BAD=90°,∠PBA=2∠ACB,所以∠POA=2∠ACB,
又∠POA=∠OBC+∠ACB,所余枝以∠OBC=∠ACB,OB=OC=AC-AO=AC-AB=16-10=6,
BP=OB/2=6/2=3.
∠PAB=∠PAO,∠APB=∠APO=RT∠,AP为公共边,
△PAB≌△PAO,AB=AO,BP=OP=OB/2,∠PBA=∠POA,
又∠ABC=3∠ACB,
∠BAC+∠ABC+∠ACB=2∠BAD+3∠ACB+∠ACB=2∠BAD+4∠或衡ACB=180°
∠BAD+2∠衫毁做ACB=90°
又∠PBA+∠BAD=90°,∠PBA=2∠ACB,所以∠POA=2∠ACB,
又∠POA=∠OBC+∠ACB,所余枝以∠OBC=∠ACB,OB=OC=AC-AO=AC-AB=16-10=6,
BP=OB/2=6/2=3.
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