11
66=11×6
121=11×11
132=11×12
(x - 10) × 2
You have to multiply it by 2 so that you get the area
It should be 18, because despite of 3,14, because that's pi and radius is half of the diameter, so36 divide 2 is 18.
Well it depends on what the model is but if it's an IRA or whatever so if you make your own model that's easy
