A circle of radius 8 cm is centered at A, and a circle of radius 12 cm is centered at B, where A and B are 20 cm apart. There is a segment that is tangent to the small circle at P and the large circle at Q. It is a common external tangent of the two circles. What type of quadrilateral is ABQP and what are the lengths of its sides? Also, determine the area of the region inside quadrilateral ABQP but outside both circles.