Exercise 2.14 - (Quick) segment trisection
Given a line segment AB, divide it into three equal pieces (par = 6).
4 circles + 2 lines = 6 steps
Consider the midpoint M of AB
ABE ans MBC are similar, and AB = 2AM, so AE = 2CM
AFE and MFD are similar, and MD = CM, so AF = 2FM