Abookmark is shaped like a rectangle with a semicircle attached at both ends. the rectangle is 18 cm long and 4 cm wide. the diameter of each circle is the width of the rectangle. what is the area of the bookmark?

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.