How can a cake(circular) be cut into 8 pieces by making just 3 cuts?

Answer:

first cut the cake into 2 circular pieces by cutting along the circumference then 2 cuts. One horizontal and other vertical
8 pieces we will get!

Make two cuts from the top and the other at right angles to the two cuts.

Make two cuts to divide the cake into 4 (cutting on the diameter of a circular cake the cuts perpendicular to each other). Now place the 4 sectors of the cake one over the other. Make a cut such that the cut goes throw the centre cutting each of the cake sectors into half. So now we have done 3 cuts. Each sector is cut into two so 4*2 8.