Pleasse :

i'm pretty sure i know the answer but i have some doubts.

Since it is a square, the angles are 90 degrees. The diagonals would bisect the angle in half so the angle PRS would be equal to 45 degrees.

45 degrees because each angle in a square is 90 degrees divided in half by the diagonal is 45

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.