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# What is a datum line?

**A datum line is a point of reference or standard for comparison.** The term is primarily used in reference to surveying and engineering, where it is used in the measurement of depths and heights.

In general, a datum line is a tool used by engineers to ensure the accuracy of measurements. Engineers use the datum line as a horizontal base line to exactly measure various heights. Datum lines are valuable in the development of railway plans, as well as other complex engineering drawings. These lines are critical to guaranteeing measurement precision and avoiding errors from the start of a project.

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Q:
## What are opposite rays?

A: Two rays are opposite rays in geometry if they have a common initial point and form a straight line. Essentially, these rays point in opposite directions. ... Full Answer >Filed Under: -
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## How do you go from point-slope form to slope-intercept form?

A: To convert a point slope form equation to a slope-intercept form, you must simplify the equation. The simplified equation has "y" on one side of the equals... Full Answer >Filed Under: -
Q:
## How is underutilization depicted on a production possibility frontier graph?

A: Underutilization is depicted on a production possibility frontier graph by a point located between the origin and the production possibility frontier itsel... Full Answer >Filed Under: -
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## What is rate of change?

A: The rate of change, also known as the slope of a line, is a measure of how fast the line changes in the vertical direction compared to the horizontal direc... Full Answer >Filed Under: