Hello there. To solve this geometry question, we'll need to remember how to find the area of an annulus.
Let's start by drawing the circles:
Remember that the area of the shaded area, between the outer and inner circle, called annulus, can be calculated by subtracting the area of the outer circle and the area of the inner circle:
The area of a circle with diameter D is given by:
[tex]\pi\cdot\text{ }\frac{D\text{\textasciicircum{}2}}{4}[/tex]
