Answer:

Explanation:
We have a hemisphere with a radius 9 cm with a hemisphere cut out with radius 8cm.
Calculate a volume of a larger hemisphere and subtract from it a volume of smaller hemisphere.
The formula of a volume of a sphere:

R - radius
Therefore the formula of a volume of a hemisphere:

The volume of the larger hemisphere:

The volume of the smaller hemisphere:

The volume of wood:

Substitute:
