A lesson in drawing spirals, using three techniques: 1) A simple spiral, done in only three blocks using MOVE and TURN, with a smoothly changing turn angle 2) Archimedes' spiral, which in polar coordinates has the very simple equation R = CA radius = constant x angle 3) Logarithmic spiral, which in polar coordinates has the equation R = Cexp(kA) radius = constant x (e ^ constant x angle) For (2) and (3) we have a simple conversion from polar coordinates to X,Y coordinates, using X=R cos(A), Y=R sin(A).
