How many quadrilaterals are there in the given figure?

19 21 18 22

22

THE LOGIC; => 8 inner quadrilaterals + ABCD, ABST, AMQT, LPSB, TWUS, POUS, TRVW, CWUD, TRNC, LOUB, AWUB, TCDS, RSND, ALOW. Thus, total 22 quadrilaterals.