A piece of cake is simply called (and spelled) "a piece of cake." It may also be called "a serving of cake" or "a slice of cake."
Used a piece of cake for what reason?
The Cake Eaters was created in 2007.
A cone has only one face and laid flat it would look like a piece/slice of cake
What ever colour you perceive the piece of cake to be.
A Piece of Cake - album - was created in 1996.
Piece of Cake - novel - was created in 1983.
A piece of cake is however much you want or deserve.
An example for the use of the idiom 'it's a piece of cake' is: I can run that 100 yard sprint, it'll be a piece of cake'.
Piece of cake
Piece of Cake - novel - has 672 pages.
"A piece of cake" means something is very simple for someone to do. Example: I found chemistry difficult, but for Kris, it was a piece of cake.