Reference angle of a particular angle depends on the quadrant in which it lies. Reference angle always uses x-axis as the frame of reference.

__Reference angle in first quadrant:__Every positive angle in the first quadrant is acute. So, the reference angle will be the measure of the angle itself.

Reference angle in second quadrant:In the second quadrant, for a given angle say x$^{\circ}$, reference angle is got by subtracting x$^{\circ}$ from 180$^{\circ}$.

Reference angle in third quadrant:In the third quadrant, for a given angle say x$^{\circ}$, reference angle is got by subtracting 180$^{\circ}$ from x$^{\circ}$.

**Reference angle in the fourth quadrant:**In the fourth quadrant, for a given angle say x$^{\circ}$, reference angle is got by subtracting x$^{\circ}$ from 360$^{\circ}$.