A machining company manufactures washers. The dimensions of the washer are 2cm for the inner circle and 4cm for the outer circle. And the inner and outer radii is positive and negative 2. The range of acceptable values is called the tolerance.

Question

A machining company manufactures washers. The dimensions of the washer are 2cm for the inner circle and 4cm for the outer circle. And the inner and outer radii is positive and negative 2. The range of acceptable values is called the tolerance. 
Write an equation for the area of the face of the washer in terms of r,R, and pi.
Write a compound inequality for the area, to the nearest tenth of a square centimeter, or the face of the washer.

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