CHAPTER 3. GEOMETRY i ïÜÉêÉ=é = K== O = = = 3.19 Circle = o~ÇáìëW=o= aá~ãÉíÉêW=Ç= `ÜçêÇW=~= pÉÅ~åí=ëÉÖãÉåíëW=ÉI=Ñ= q~åÖÉåí=ëÉÖãÉåíW=Ö= `Éåíê~ä=~åÖäÉW=α = fåëÅêáÄÉÇ=~åÖäÉW=β = mÉêáãÉíÉêW=i= ^êÉ~W=p= = = α 260. ~ = O o ëáå = O = = = Figure 30. = 50