The lowest point of an arc is called the nadir. In geometry, the nadir is the point on the arc that is farthest below the center of the arc's circle. It is the point where the arc changes direction from descending to ascending. The nadir is a critical point in understanding the overall shape and characteristics of the arc.
A circle, or arc thereof.
Nadir
The highest point is sometimes called the zenith, peak, apogee, maximum or a number of other synonyms.
An arc. The arc covering less than half the circumference is called a minor arc; the arc covering more than half is called a major arc.
No. Because a radius extends from the arc to the point. Chord extends from one point of the arc to another.
The lowest point of a wave is called the trough. It is the point where the wave's amplitude is at its most negative value.
The lowest point of a wave is called the trough.
The lowest point on a wave is called the trough. It is where the displacement of the wave is at its minimum value below the equilibrium position.
The lowest point of a wave is called a trough.
The lowest point of a light wave is called the trough. This is where the wave reaches its minimum amplitude or lowest point of displacement from its equilibrium position.
Thalweg
A swinging pendulum is moving fastest at the lowest point of its arc. That is the point where all its potential energy has been converted into kinetic energy, and it is the only point in a pendulum's arc where that happens. See related link (a simulation).
A circle, or arc thereof.
The lowest point on a transverse wave is called the trough
The low point of a wave is called the trough, which is the lowest point of a wave where the displacement is at its minimum. This is the point where the wave reaches its lowest value below the equilibrium level.
Thalweg
The highest point of a transverse wave is called the crest, while the lowest point is called the trough.