If A = {Quadrilaterals} and B = {Rectangles}, then set A and set B are
overlapping sets
A = {Quadrilaterals}
⇒ A = {Trapeziums, Parallelograms, Rhombuses, Rectangles, Squares, Kites}
B = {Rectangles}
⇒B = { Rectangles}
⇒ Rectangles are common in both the sets.