The area A of a sector of a circle is given by A=nr2s/360

Comment

I'm not terrible certain I know what you are trying to do here. The question is not clear. Maybe if I give an example of how to use the formula, it make clear what the formula does. Below is a diagram. Label the ends of the circle's radii as A and B. Label the center of the circle as O.

The sector of the circle is AOB. The area is that which is inside AOB. The formula you have quoted is for the region inside AOB. The n should be a pi. They look very much alike.

The s should be an angle in degrees. It is angle
Suppose the Givens are

π = 3.14

S = 150°

r = OA = 10

What is the Area of such a sector?

Area = π r² s/360

Area = π 10² 150/360

Area = π 100 * 150 / 360

Area = π 15000 / 360

Area = π 41.667 Sometimes this is the answer, and sometimes they want a decimal amount

Area = 3,14 * 41.667

Area = 130.8997 is the decimal amount.

The area of a circle = π r² = 100 * π

The decimal amount of the Area of the circle = 100 * 3.14 = 314

Notice that the area of the circle is bigger than the sector. Isn't that the way it should be?

So what do you need to find the area of a sector? You need

1. The radius.

2. Pi

3. The measurement of the central angle.