home construction Extra
a1 a2 a3 a4
b1 b2 b3 b4
Buttons		 foundation
intermediate
advanced
Please enable Java for an interactive construction (with Cinderella). Please enable Java for an interactive construction (with Cinderella). Please enable Java for an interactive construction (with Cinderella).
See Euclid's Proposition 2. See also a discussion on Circle construction based on this task.
This version incorporates solutions found at the IMECT3 conference, Cambridge University, 2002