"Rear legroom is horizontal distance between the front edge of the rear seat and front seatback. Headroom is measured from the seat swab to the roof lining."
Not a very good answer. Does not specify if the front seat is in the forward or back position when measuring rear legroom.
You first measure the distance between the points as shown on the map, then you compare that measurement with the map scale.
Under SAE guidelines, legroom is measured using an H-point machine (for hip-point), a mechanical device with a single leg and adjustable joints that "sits" on a seat. The H-point is the starting point for measuring legroom, but Gary Pollak, a manager of SAE research programs, said it is not a linear measurement but a curve based on several points. "There are a number of ways to do it," Pollak said, and a consumer may not be able to replicate a manufacturer's measurement with a tape measure. "It's a question of how they go about reporting (the measurements), and some may take liberties," he said. "People interpret the standard to their advantage, so there's not an easy answer." The bottom line is that the interior dimensions published by manufacturers are best used as guidelines rather than gospel
Length is the measurement of distance between two points.
Points is a measurement for font size
it is impossible to use points as a unit of measurement because they are exact locations with no dimensions
Calipers are for measuring diameter of rounded objects. For instance you measure a ball, then carefully not changing the measurement pull the caliper off the ball and measure the gap between it's points with a ruler.
Measurement always deals with a distance of a line or a distance between to objects, distance between 2 points, and so on.
This question is very vague, as there are numerous formulas, but they all require at least three pieces of information. You need a reference for making that measurement, unless you simply take the measurement yourself, in which case, you need no formula...get a tape measure
The best way to find out if 2 points have equal elevation is to measure them. You must measure each of these points.
All isomaps have lines on them that join points of equal measurement. The measurement is elevation above sea level.
The points of measurement for a lateral skull radiograph is the high point of the zygomatic arch.
To measure an angle you must take all the points in between the two. Therefor it could be anywhere from 2 to 100 points.