Introduction to Geometry
Lecture
Plan (Korean)
Geometer's Sketch Pad files: 2004.zip
Euclid's
Elements
Geometry Site organized by University of Tennessee, Knoxville.
Three bar linkage by Cinderella
Dual Theorem of Pappus by Cinderella, a special case
Conic Curve Generaion by Cinderella
Draw tangent lines from a point to a circle (including details in Korean)
Hints on the Midterm
Examination(2004/04/28) (Korean)
Help file for theorem
7.5, page 292 (Korean): harmonic.hwp
Lobachevskii (1792-1856)