we know each pancake has a diameter of 12 inches, so its radius is half that, or 6 inches.
so the area of each pancake is A = πr², or π6², or 36π, or about 113.097 in².
now, the round plate can only hold 100 in², so the pancake will be overflowing the plate by 113.097 - 100 or about 13 in².
what we can do is, give me the pancake, I'll eat the 13 in², and then we'll fit in the plate.