Sin 3θ = 0
3θ = sin^-1 0 = nπ
θ = nπ/3
1 yard = 3 feet
7 yard = 21 feet
21 + 2 = 23 feet
Think of the two pieces together as a single cone of height 19, and its volume.
Then think of only the upper piece as a cone, and find its volume.
The volume of the frustum is the total volume minus the volume of the upper piece.
The volume of a cone is:

Total volume:

Volume of upper cone:

Volume of frustum:
There isnt a image of the shape