What constitutes an indirect measurement?

An indirect measurement is defined by the use of mathematical formulas or the proportions of similar figures to determine a value that cannot be easily or directly measured. For example, in geometry, you may use the properties of similar triangles to find the height of a tree by measuring the length of its shadow and the distance from the measuring point to the base of the tree.

This approach allows for more flexibility and applicability in various contexts where direct measurement is impractical or impossible. Indirect measurements expand the range of tools and methods available for making measurements by relying on mathematical relationships between known quantities, rather than being limited to physical measuring tools or direct observation.