Parallel lines have the same slope. Put the equations in slope-intercept form. y=6x-2, and y=6x-1. Since the slopes are the same, 6x, then yes, the lines are parallel.
On the unit circle, the abscise (x) is the cosine and the ordinate (y) = sinus
So y is the sinus
17.5 inches
Radius is half of diameter so just do this process:
35/2 = 17.5
That’s a good deal if i do say so myself.