The formula r²h is used to calculate which geometric measurement?

The formula r²h is used to calculate the volume of a cylinder. In this formula, "r" represents the radius of the cylinder's base, and "h" represents the height of the cylinder. The area of the circular base is calculated first using r² (where r is squared) multiplied by π (pi), but it's common to express the volume formula in terms of just r²h for a simplified understanding of how to arrive at the total volume.

For a cylinder, the overall volume is determined by multiplying the area of the base (which is a circle) by its height. Therefore, the correct answer emphasizes that this formula neatly encapsulates the relationship between the dimensions of the cylinder and the total space it occupies.

The other options represent entirely different geometric concepts, making them inapplicable in this scenario. For instance, the area of a triangle involves a different formula altogether, while the circumference of a circle focuses on the perimeter rather than volume. The area of a square also relies on a much different formula, focusing solely on the square's dimensions.