quadrant
Angleexact by definition
A quadrant is exactly a quarter of a full turn, 90 degrees, or π/2 radians. It names both the angle and the region: the four quadrants of the Cartesian plane and of the unit circle are the domains that trigonometric sign conventions are stated over.
Watch out: The quadrant is also an instrument, the pre-sextant device for measuring altitude at sea, and older texts use the word for the tool rather than the angle.
| 1 | 90 |
One quadrant in every angle unit
| 324,000,000,000 | microarcsecond (μas) | |
| 324,000,000 | milliarcsecond (mas) | |
| 1,570,800 | microradian (μrad) | |
| 324,000 | arcsecond (″) | |
| 5,400 | arcminute (′) | |
| 1,600 | mil (NATO) (mil) | |
| 1,570.8 | milliradian (mrad) | |
| 100 | gradian (gon) | |
| 90 | degree (°) | |
| 8 | compass point (point) | |
| 6 | hour angle (h) | |
| 1.5708 | radian (rad) | |
| 1 | quadrant (quad)this unit | |
| 0.25 | revolution (rev) |
Solvers that use angle