Final answer:
When the radius remains the same but the height is reduced by half, the volume of the cylinder decreases proportionally.
Step-by-step explanation:
When the radius of a cylinder remains the same but the height is reduced by half, the volume of the cylinder decreases proportionally. The volume of a cylinder is given by the formula V = πr²h, where V is the volume, r is the radius, and h is the height. Since the radius remains the same at 0.7, the volume will decrease by half, resulting in a smaller volume.