As with a lot of things there is no truly right or wrong way to slice your cake. Most will go with what is easiest for them or what they are accustomed too. The shape of the cake is often a factor which will determine how the cake will be cut. Square and rectangular cakes would probably be considered the easiest to cut because of their geometric shape. The circular cake has a few different options. In recent years with couples taking a more individual approach to the style and feel of their wedding there has been an emergence of hexagonal and petal shaped cakes. The only point I will raise is the each method will provide you with a varying number of slices. So how you choose to slice your cake is really a matter of personal choice.
The rectangular/square cake Simply cut across the cake then divide each slice as you wish.
The Circular cake 1. Probably the most popular way to cut a round cake is in wedges. The cake is first cut in half then into quarters then each quarter is in turn Cut into halves and quarters.
2. Cut a circle in the centre of the cake. This is achieved by sticking the knife straight into the cake, approximately 5 cm (2 inches) in from the edge of the cake; cutting a circle in the centre of the cake. Then you cut the slices up to the central circle.
3. Otherwise you can adopt the method for cutting a square cake.
The Hexagonal cake So far I have found the easiest way to cut a hexagonal cake is to cut parallel slices from one side then cut each slice to a desirable size.
The Petal cake The cutting of this cake is takes a bit of deconstruction, but is relatively straight forward. Cut each petal off at the joining point Then slice the petal section either cross-wise or length-wise. In the example below the remaining section of the cake is in the shape of a pentagon which can be slice as the a hexagon cake would be sliced