Pedulum question!?

When given Period of T=1.6s, Frequency =0.625 hz, angular frequency of 3.93 rad/s, amplitude =6, can you tell how long the pendulum will be? I was given a graph to go with this problem too. The graph showed a line on theta(degrees) vs. t(s) it starts at theta 6 degrees and goes down to theta -6, and from 0 to 3 seconds. It has troughs at -6 degrees, and peaks at 6 degrees, 1 peak and 2 troughs in the whole graph. Not sure if you need this info though to figure out the length of the pendulum