Which statements are true about quadrilaterals? choose all answers that are correct. a. all 4-sided shapes are parallelograms. b. all rectangles are parallelograms. c. all squares are rhombuses. d. some trapezoids are parallelograms.

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.