DrGeo Smalltalk Sketches for Problems in Plane Geometry
# sharygin DrGeo Smalltalk Sketches for Problems in Plane Geometry Some Cuis (Smalltalk-80) https://cuis.st DrGeo sketches for "Problems in Plane Geometry" Collection of various problems by Igor Fedorovich Sharygin (USSR) Some problems from mathematical olympiads or from the journal Quant (Moscow) Published MIR Publishers 1988 revised from the 1982/1986 russian editions. ISBN 5-03-000180-8 Section1 : 296 fundamental facts of plane geometry Problem 19 : circumscribe circle convex quadrilateral if AB+CD=AD+BC Problem 236 : ratio diagonals division in circumscribed convex quadrilateral Section2 : 381 selected problems of plane geometry Problem 153 : Simson line Problem 154 : Angle between 2 Simson lines Problem 317 : Simson line for quadrilateral inscribed in a circle Problem 318 : auxiliary problem/result for Poncelet theorem Problem 320 : Morley theorem Appendix : 27 problems on inversion