Plane angles have been measured in many different units. The most contemporary units are the degree ( ° ) and radian (rad), but many others have been used throughout history.
The radian (rad) is the SI unit for measuring angles. one radian is just under 57.3 degrees. Accepted prefixes still not accepted in pure math.
A quadrant unit is a unit of plane angle. It is equal to 1/4 of the full circle or 90 degrees. The plural name is quadrants.
Multiply the quadrant value by 1.570796
radian = quadrant x 1.570796
Divide the radian value by 1.570796
quadrant = radian / 1.570796
One radian (rad) is equal to 0.636620 quadrant
1 radian (rad) = 0.636620 quadrant
One quadrant is equal to 1.570796 radian (rad)
1 quadrant = 1.570796 radian (rad)