1.连接AC,设AD,BC交于O
用到的关系:
角PCB=角DCB/2
角PAD=角BAD/2
角P=180-(角BCA+角DAC)-(角PCB+角PAD)=180-角DOC-[(180-76-角DOC)/2+(180-40-角DOC)/2]=180-180+38+20+角DOC-角DOC=58
2.设BP延长交AC于D
角BPC=角PDC+角PCD=角A+角ABD+角PCD>角A
1.连接AC,设AD,BC交于O
用到的关系:
角PCB=角DCB/2
角PAD=角BAD/2
角P=180-(角BCA+角DAC)-(角PCB+角PAD)=180-角DOC-[(180-76-角DOC)/2+(180-40-角DOC)/2]=180-180+38+20+角DOC-角DOC=58
2.设BP延长交AC于D
角BPC=角PDC+角PCD=角A+角ABD+角PCD>角A