(2) Let us mark the vertices on thegiven figure as:
There are 23 quadrilaterals in thegiven figure, as listed below:
i) EIGF, (ii) ICBG, (iii) ECBF, (iv)EHGF, (v) EIHF, (vi) ICBH, (vii) HCBG,(viii) FHBA, (ix) EBAF, (x) FCBA, (xi)EHAF, (xii) HCBA, (xiii) EIAF, (xiv)ICBA, (xv) EDAF, (xvi) DCBA, (xvii)EDCH, (xviii) EDHF, (xix) DCBH, (xx)EDGF, (xxi) DCBG, (xxii) EDCF and(xxiii) EDCB