Hey there!
First, you would need to find the area of the circle/pizza . . .
Formula of finding area → pi*r² (Pi * the radius of the circle/pizza²)
---
Once you have found the area, you would need to divide the result by the number 12 since there is a total of 12 slices in the pizza.
---
This is how you would find the area of one slice of pizza.
__________________
I hope this helps you.
Have a great day! :)