the number i. The angle between i and the x-axis is 90 degrees (Figure 33). What happens when you square i? Well, by definition, i2=–1—a point whose angle is 180 degrees from the x-axis; the angle has doubled. The number i3 is equal to –i—270 degrees from the x-axis; the angle has tripled. The number i4=1; we have gone around 360 degrees—exactly four times the original angle
