the area of two 7" inch pizzas is calculated as:
2(π*(3.5)^2) = 24.5π.
the square root of 24.5 is a little less than 5. so, two of these things is equivalent to a 10" pizza made by a dishonest cook trying to rip you off a half inch, which is probably all of them.
i would split the recipe up, but the point is to make as much as i can get out of a can of tomato paste, and that's two medium pizzas, apparently.