To divide a cake into 8 pieces, you need a minimum of three cuts. Here's how you can achieve it:
- Make two cuts across the cake horizontally, dividing it into three equal layers.
- Then make one vertical cut through the center of the cake, dividing it into two halves.
By doing this, you will have a total of eight pieces: three layers horizontally and two halves vertically, resulting in eight equal slices.