are dry.
now we're going to check to see if we can find the leak. start by turning on the cold water (usually the stop on the right side under the sink) first by turning the knob on the angle stop counter clockwise by hand. now look carefully at the underside of your sink, particularly the connection points.
if you see water dripping, try and figure out exactly where it's coming from.
if it's at the angle stop, there's a chance your supply line just needs tightened. turn the water off at the angle stop, then take an adjustable wrench or groove joint pliers and carefully try to tighten the supply line nut 