The Solution:
Given:
Required:
To find the area of the shaded region.
The area of the shaded region is:
[tex]Area=\pi R^2-\pi r^2=\pi(R^2-r^2)[/tex]
In this case,
[tex]\begin{gathered} R=15+4=19\text{ inches} \\ \\ r=15\text{ inches} \end{gathered}[/tex]
Substitute:
[tex]undefined[/tex]
