*"I'm fed up with rectangular objects.. Do you have some
magic triangle, circle, or sphere?"* Yep! At least there is
one deserving the name *magic sphere*. Look at the following
diagram. There are 6 intersection points between the three big
circle. Try to fill 1..6 in them to make every circle sums up
to the same number! It may looks a bit difficult at first, but
in fact, once you start filling, you're nearly done.

Ummm... What about using your mathematical mind to calculate the 'magic sum' first? Click on the sphere to see the solution.

*To be continued ...*