Question

1. which statement is true?

square units are used to measure volume, cubic units are used to measure area.
square units are used to measure area, cubic units are used to measure volume.

Explanation:

Area is a 2-dimensional measurement, so it uses square units (e.g., $\text{cm}^2$). Volume is a 3-dimensional measurement, so it uses cubic units (e.g., $\text{cm}^3$). The second statement correctly matches each unit type to the measurement it describes.

Answer:

Square units are used to measure area, cubic units are used to measure volume.