Answer
(a) $"...Terminal$ $Point..."$
(b) $"... (0, 1), (1,0), (0, -1)$ $and$ $(1, 0)..."$
Work Step by Step
(a) According to the definition of a terminal point: Start at the point (1,0) on a unit circle. Walk (counterclockwise) for a distance of ‘t’ units. The point you end up at is called the Terminal Point
(b) $\pi$ means $180°$ turn counterclockwise and $-\pi$ stands for clockwise direction, so we have:
$\pi/2$ is $90°$ turn counterclockwise, point $(0, 1)$
$\pi$ is $180°$ turn counterclockwise, point $(1, 0)$
$-\pi/2$ is $90°$ turn clockwise, point $(0, -1)$
$2\pi$ is $360°$ turn counterclockwise, point $(1, 0)$
