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Using pi r squared:
The area of a 6" cake is 28.25 sq"
The area of 12 " cake is 113 sq"
the area of a 12 inch circle is 4 times the area of a 6 " circle
if you want the cake to be the same thickness, you will need 4 times the amount of batter for a 12" cake. If your original recipe made two 6 " layers, then doubling it will make one 12" layer . HTH
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