The diagonal length of a rectangle is 21 inches, and the length of the rectangle is 8 inches. Which measurement is closest to the width of this rectangle in inches?

13 in.
19.4 in.
22.5 in
29 in.
Plz help

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.