Question 310947
Area of topping = area of circle with diameter 8"
Radius = 4"

area = pi*r^2
pi^4^2
=pi*16
.
7 layers 
= 7*pi*16
= 351.85 sq. in
.
one recipe covers 55 sq in
351.85 sqin will require 351.85/55
= 6.39
= 7 batches