Consider a circle of radius 8 and a point $P$ rotating around it, as shown in the figure to the left, below. The angle $\theta$, in radians, is given as a function of time $t$, by the graph in the second figure.
(a) What is the value of $\theta$ when $t=1$?
$\theta=$ .
(b) Find the coordinates of $P$ when $t=1$.
Coordinates = ( , ).