it feeds 2 normal adults, maybe more if they are kids or women
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The area of a 16" pizza is 201.2 sq inches which is 0.1297 sq metres
I suggest you divide the 14 inches and the 11 inches by 2 to get the radius (presumably, the numbers refer to the diameter). Then you can calculate the area using the formula for a circle, and compare.
Thinking reasonable slices here, I thought it out a minute and it is reasonable to say, about 8 people for an 8 inch cake. Taking a picture of an 8 inch circle (to scale) and drawing on it first a line across the middle center, and then to make it fours, and two more lines across and you get 8. SO 8 :D
A pizza typically contains about 8-10 slices. If it's just for a snack, two pizzas should be enough for everyone to have at least one slice. If a meal, 4 pizzas will allow 13 people to have at least 2 slices, with some extra for hungry people.