PROBLEM:
How is it possible to cut a traditional circular cake into 8 equal size pieces, with only 3 cuts?
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
SOLUTION:
Make the first two cuts as cross-sections, making 4 equal pieces.  The third and final cut is made horizontally through the middle, making a total of 8 pieces