What are the differences between direct measurement and indirect measurement, and how do they impact the accuracy of the data collected?

Direct measurement involves obtaining data by directly measuring the quantity of interest, such as using a ruler to measure length. Indirect measurement involves using other measurements or calculations to determine the quantity, like using the Pythagorean theorem to find the height of a tree. Direct measurements are generally more accurate because they involve fewer steps and potential sources of error. Indirect measurements can be less accurate due to the additional calculations and assumptions involved.