The image on the right shows the half of an orange cut from top to bottom. The core of the orange clearly shows the line of symetry. All wedge pieces of the orange are aligned around the core

As we can see frm this cross section, the nine wedge-shaped pieces are distincly seperated.

From my observation, I wonder why there is usually odd number of pieces in an orange?

Roll-over the images to see the lines more clearly