Height or Distance Calculation with a ruler (Biltmore stick)
Calculation of the height or distance of an object with the aid of a ruler. One value, distance or height, must be known or estimated. At length of the stretched arm from eyes to ruler, an average value (in cm) is set. For a better estimation, you should take your measure.
Biltmore stick: stretch one arm and hold up a ruler. On this, you can read the apparent height of the distant object.
Formula: d = b * c / a
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