Most people measure the penis when it is erect because temperature and emotion can effect the length of a flaccid (soft, limp or unerect) penis. Usually a rule (or ruler if you wish) is placed along the upper side of the penis with one end of the rule/ruler touching the pubic area and the measurement at the tip of the penis is then read off on the rule/ruler.
you measure from where the penis meets ur body
You don't, instead use a tape measure.
the measure of a straight-line distance between two points is called length.
The best way to find out if 2 points have equal elevation is to measure them. You must measure each of these points.
To measure an angle you must take all the points in between the two. Therefor it could be anywhere from 2 to 100 points.
You should use a special device for measuring angles - a protractor. With a ruler, it is much more complicated, but still possible: you can mark two points on the angle, one on each side; measure the distance from the vertext of the angle to those points; measure the distance between the points; then use the Law of Cosines to calculate the angle.
It allows you to measure distances between two points.
distance is the measure of the length between two points where as displacement is the shortest distance between the points.
potential difference between two points in a circuit
Measure the distance between the two end points!
By using the distance formula between two coordinated points
It is the difference between two points on a line in accepted units.
One measure of distance between them.
A voltmeter is used to measure the difference in electric potential ("voltage") between two points, usually but not necessarily in an electrical circuit..