The radian is the standard unit of angular measure, used in many areas of mathematics. An angle's measurement in radians is numerically equal to the length of a corresponding arc of a unit circle; one radian is just under 57.3 degrees (when the arc length is equal to the radius). The unit was formerly an SI supplementary unit, but this category was abolished in 1995 and the radian is now considered an SI derived unit.
Separately, the SI unit of solid angle measurement is the steradian.
The radian is represented by the symbol rad (Unicode-encoded as U+33AD ㎭ ). An alternative symbol is c, the superscript letter c, for "circular measure", or the letter r, but both of those symbols are infrequently used as it can be easily mistaken for a degree symbol (°) or a radius (r). So for example, a value of 1.2 radians could be written as 1.2 rad, 1.2 r, 1.2rad, or 1.2c.
Radian describes the plane angle subtended by a circular arc as the length of the arc divided by the radius of the arc. One radian is the angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle. More generally, the magnitude in radians of such a subtended angle is equal to the ratio of the arc length to the radius of the circle; that is, θ = s /r, where θ is the subtended angle in radians, s is arc length, and r is radius. Conversely, the length of the enclosed arc is equal to the radius multiplied by the magnitude of the angle in radians; that is, s = rθ.
Radian (Louis Armanetti) is a fictional character, a superhero in the Marvel Universe, member of the Strikeforce: Morituri. The character was created by Peter B. Gillis and Brent Anderson.
Radian (Louis Armanetti) was created by writer Peter B. Gillis and artist Brent Anderson and debuted in Strikeforce: Morituri #1 (December 1986). The codename "Radian" was introduced in issue #2. Radian remained in the regular cast of the book until his death in Strikeforce: Morituri #15.
Virtually nothing is known of Louis Armanetti's life, prior to his decision to join the Strikeforce: Morituri. A jokester and quick to mask his insecurities and fears behind jokes, in 2073, Armanetti volunteered for the Morituri process, a revolutionary scientific progress which gifts ordinary people with superhuman abilities. Armanetti was found genetically compatible for the process, one of only a handful among thousands of applicants. However, the recipients gained their powers at a terrible price: a fatal flaw in the process which ensures their death within a year of receiving it. The objective of this process was the formation of a team of superpowered beings which could be utilized as Earth's combatants in Earth's ongoing war against the savage alien race known as the Horde.
Radian may refer to:
It may also refer to a number of species:
I said child it's time to go
He said please you're my only hope
But it's too late, and the Gods won't wait
So come with me before I leave
CHORUS
And say what you want but it's time to lose control and let go
Say what you want but these gates are closed I cannot know how you feel
Say what you want but your tears cannot heal wounds this deep, I swear
I know you must hurt real bad
I said wait, we've come so far
But he just cried, his body and heart
But it's gone by, and you'll feel in time
So just keep on, baby, run or die
CHORUS
Morgan Citizen
17 Apr 2025