How to solve for tangential velocity given string length and angle?

i'm given that a ball hangs from a string and rotates in a conical pendulum.... the string length is 1.8m and the angle between the string and vertical is 30 degrees and i need to find the tangential velocity. gravity is 9.8 obviously, and i can solve for the radius of the path using 1.8sin30 .....also i need to find how long it will take for the ball to rotate one time around the vertical axis. thanks for your help : )