Recall the following definition: Let be an angle in standard position. The reference angle of 0 is the acute angle formed by the terminal side of 0 and the horizontal axis. Below, express the reference angle for 0 in the same units (degrees or radians) as 0. You can enter arithmetic expressions like 210-180 or 3.5-pi. The reference angle of 100 is The reference angle of 350 is The reference angle of 4 is