What is the primary use of the formula V = 1/3Bh in geometry?

The formula ( V = \frac{1}{3}Bh ) is primarily used to calculate the volume of solids, specifically for pyramids and cones. In this formula, ( B ) represents the area of the base of the solid, and ( h ) is the height from the base to the apex. The factor of ( \frac{1}{3} ) accounts for the geometric properties of these three-dimensional shapes, indicating that their volume is one-third that of a prism with the same base area and height. This formula is foundational in geometry, particularly when working with three-dimensional figures, which is why identifying it as a method for finding volume is correct.

In contrast, the other choices either relate to different geometric calculations or concepts not applicable to this specific formula. Surface area calculations require different formulas that often involve dimensions of all faces of a solid, while perimeter concerns linear measurement around two-dimensional shapes. Similarly, finding dimensions of solids involves measurements rather than volume calculation.