设F,G,H分别是AB,BC,CA上的切点
则:BF=BG,CG=CH
△ADE的周长=AD+DE+AE=AD+(DF+EH)+AE
=(AD+DF)+(EH+AE)=AF+AH
=AB+BC+CD-BF-BC-CH
=29-BG-BC-CG
=29-BC-BG-CG
=29-8-(BG+CG)
=21-BC
=21-8
=13
设F,G,H分别是AB,BC,CA上的切点
则:BF=BG,CG=CH
△ADE的周长=AD+DE+AE=AD+(DF+EH)+AE
=(AD+DF)+(EH+AE)=AF+AH
=AB+BC+CD-BF-BC-CH
=29-BG-BC-CG
=29-BC-BG-CG
=29-8-(BG+CG)
=21-BC
=21-8
=13