Math in CAD

Mathematical formulation behind some CAD sketch tools are discussed. Drawing a tangent line to a circle from a point outside: 6:00 Circle through 3 points: 14:42 Tri-tangent circle: 24:27 Drawing a line normal to a curve: 32:38 Drawing an ellipse: 33:47 Bitangent line (line tangent to 2 circles/arcs): 41:32