The frame of a lampshade is cylindrical in shape. it has base diameter 28cm and height 17 cm . it is to be covered with a decorative cloth. a margin of 2 cm is to be given for folding it over top and bottom of the frame. if 1/12 of the cloth is wasted in cutting and pasting ,find how mush cloth is required to be purchased for covering the frame

This should help :D Hopefully 

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.