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CHAPTER 3. GEOMETRY
3.15 Tangential Quadrilateral
=
páÇÉë=çÑ=~=èì~Çêáä~íÉê~äW=~I=ÄI=ÅI=Ç=
aá~Öçå~äëW=Ç N Ç I O =
^åÖäÉ=ÄÉíïÉÉå=íÜÉ=Çá~Öçå~äëW=ϕ =
o~Çáìë=çÑ=áåëÅêáÄÉÇ=ÅáêÅäÉW=ê=
mÉêáãÉíÉêW=i=
pÉãáéÉêáãÉíÉêW=é==
^êÉ~W=p=
=
=
=
=
Figure 26.
=
242. ~ + Å = Ä+ Ç =
=
243. i = ~ + Ä+ Å + Ç = O (~ + Å ) O += (Ä ) Ç =
=
Ç O O (Ç − )~ − O ( Ä ~ + é )Ä− O
244. ê = N O I==
O é
i
ïÜÉêÉ= é = K==
O
=
45
