Please help steer me in the right direction If there are 8 s

Please help steer me in the right direction!

If there are 8 slices to a box of pizza, how many pizzas can you fit in a room that is 100 square foot big and the whole pizza was 18 inches large?

So far I found the area of one slice.

radius = 9\"

Area = 1/2(pie/4)(9)²

^{= (pie/8)*81}

Area of one slice is approximately 31.81 in².

Do I divide than multiply? Certainly having trouble trying to find a formula that will help piece this math question. Many thanks in advance.

Area of whole pizza = 31.81 * no of pieces

= 31.81 * 8 = 254.48

Yeah, how many pizzas can you fit in a room= area of room/ area of pizza