What is the reference angle of 1000 degrees?
1000 degrees = 720 degrees + 280 degrees
So, 1000 degrees is two full rotations plus 280 degrees
And 280 degrees is an 80 degree reference angle in the 4th quadrant.
From 1000° keep subtracting 360° until you get an answer in the range: 0° ≤ angle < 360°.
