UNSOLVED
The following old foxie  remain unsolved!  Some easy, some hard.
Let's give them another chance.  Discuss your answers at blog.

 
Labels: Areas, Circle, equilateral triangle, heights, Unsolved
DISCUSS HERE!

 
Labels: 3D, Convexity, Sphere, Tetrahedron, Unsolved, Volume
DISCUSS HERE!

Labels: Expected value, Random process, Random walk, Unsolved
DISCUSS HERE!

Labels: chords, circle, Poligon, proof, Ptolemy, UN-SOLVED
DISCUSS HERE!

 
Labels: circle, Complex Numbers, equilateral triangle, Euler's Identity, Ptolemy, UN-SOLVED
DISCUSS HERE!