Explanation:
the volume of a regular shape like a cylinder is
ground area × height.
the ground area is the area of a circle.
the area of a circle is
pi × r²
r is half of the diameter, so, 17/2 = 8.5 ft
so, the volume is
pi × (8.5)² × 50 = 3.14 × 72.25 × 50 = 11,343.25 ft³
rounded to the nearest whole number
11,343 ft³