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CHAPTER 3. GEOMETRY
165. Ü = ÑÖ I===
O
ïÜÉêÉ=Ü=áë=íÜÉ=~äíáíìÇÉ=Ñêçã=íÜÉ=êáÖÜí=~åÖäÉK==
=
~ O Ä O
166. ã = Ä − I=ã = ~ − I===
O
O
O
O
~
Q Ä Q
ïÜÉêÉ=ã =~åÇ=ã =~êÉ=íÜÉ=ãÉÇá~åë=íç=íÜÉ=äÉÖë=~=~åÇ=ÄK==
Ä
~
=
=
=
Figure 10.
=
Å
167. ã = I==
Å
O
ïÜÉêÉ=ã =áë=íÜÉ=ãÉÇá~å=íç=íÜÉ=ÜóéçíÉåìëÉ=ÅK=
Å
=
168. o = Å = ã =
O Å
=
~ + Ä− Å ~Ä
169. ê = = =
O ~ + Ä+ Å
=
170. ~Ä = ÅÜ =
=
=
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