What is the area of a rectangle which is 57 cm long and its breadth is 34 cm? one weird question for you to answer, what's my name?

1938 cm for the first question
For the second...Ruth?

Area of a rectangle is length*width.
If length is is 57 cm and width is 34 cm, then area is 
(57 cm)(34 cm) = 1938 cm^2

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.