Answer:

Explanation:
Your question is incomplete without an attachment (See attachment)
Required
Determine the area of the shaded part
From the attachment;
Assume that the shaded portion is closed to the right;
Calculate the Area:




Next;
Calculate the Area of the imaginary triangle (on the right)





Lastly, calculate the Area of the Shaded Part



Hence,
The area of the shaded part is 72in²