What is the area of a circle whose radius is 4 ft?

4π ft²
8π ft²
16π ft²
64π ft²

It is pi times radius squared. if radius is 4, 4 squared is 16, the answer would be 16pi ft^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.