line
lengthThe distance between two points is called the displacement.
The shortest route between two points on the surface of a planet, when routes are limited to the planet's surface, is the arc of the great circle that connects the two points. The shortest route between two points anywhere, without regard to intervening matter or energy preventing the route from being followed, is always the line connecting the two points.
hygrometer psychrometer
The two points on exactly opposite sides of a circle are parallel to each other. This can be evidenced by finding the derivative/gradient at those points; if they are the same then the two line segments described by those points are parallel.
a calibrated instrument for measuring the potential difference between two points.
Chordophone
string instruments
Chordophone
A compass.
A musical instrument which produces sound by vibrating strings stretched between two fixed points is a chordophoneinstrument.
An extremely accurate device used as an instrument for measuring the distance between two points. Often used in machining.
Cardinal points most commonly refers to the points north, south, east and west as shown on a compass. A compass is an instrument that uses the magnetic force of the earth to determine which direction is north.
Electric force is the attractive or repulsive force between two charged particles. The potential difference between two points can be measured with a Voltmeter.
if two points have the same points then they make a vertex.
You must be talking about a compass, a directional tool.
The simply hold the instrument in a position that is comfortable to them. Each person is an individual.