Draw the angle given in degrees on the unit circle where 0 radians corresponds to the positive portion of the horizontal axis: -16pi/7

Note that π radians = 180°.
Therefore
-(16π)/7 radians = - (16π)/7 * (180/π) degrees
                          = -155.5°

Because angles are measured from the x-axis counterclockwise, the given angle is
360 - 155.5 = 204.5°

The angle is drawn on a unit circle and shown in the figure below.
The angle of 204.5° is in quadrant 3.
The four quadrants are labelled as Q1, Q2, Q3 and Q4.

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.