Turn it on it's side and cut through the middle so you have two smaller round cakes, place them flat on a surface on top of each other, cut through the middle so you now have 4 semi-circle cakes, turn through 90 degrees and cut through again. You now have eight equal sizes.... Tah Dah!
any cake do have cream on the top. Meaning that u cannot turn it on its side and cut it. but u r almost correct in answering the question. the last bits are correct. well done,lol