Find the volume of the solid generated when R (shaded region) is revolved about the given line.
y = 18 - √x, y = 18, x = 324; about y = 18
0 ≤ x ≤ 360
0 ≤ y ≤ 36
A coordinate system has a horizontal x-axis labeled from 0 to 360 in increments of 36 and a vertical y-axis labeled from 0 to 36 in increments of 3. A horizontal line crosses the y-axis at 18. A vertical line crosses the x-axis at 324. A curve falls from left to right and passes through the points (0, 18) and (324, 0). The region below the horizontal line, to the left of the vertical line, and above the curve is shaded.
Question content area bottom
Part 1
The volume of the solid obtained by revolving the region about y = 18 is
  
enter your response here.
(Type an exact answer, using pi as needed.)