What is the radius of the circle pictured above?

(1) The measure of arc PQ is 4pi.

(2) The center of the circle is at point O.

Even if we were told that angle POQ is 90 degrees, how do we know that

Statement 1 is talking about the minor arc AB and not about the major arc AB?? Is it right to assume it as minor arc AB?

Have my GMAT in 2 days. Please answer.