Which figure or group of figures would provide the most accurate model for estimating the volume of the dumbbell?
1. Cylinder
2. Two cylinders
3. Two hemispheres and a cylinder
4. Hexagonal prism
Which figure or group of figures would provide the most accurate model for estimating the volume of the dumbbell?
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The most accurate model for estimating the volume of a dumbbell would be three: two hemispheres and a cylinder.
### Explanation:
A dumbbell typically consists of two rounded ends (the weights) connected by a central rod. Two hemispheres can accurately represent the spherical weights, while a cylinder can represent the rod connecting them. This combination closely resembles the actual shape of a dumbbell, making it the best choice for volume estimation.
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