A is AG⊥BF in g and AH⊥DF in H.
∴∠FBA=30,∠DBF=45
∴BG=6, BF=DF=5 times the root number 2.
FH=AG=2 times the root number 3,
∴AH=FG=(5 times the root number 2)-6
DH = (5th root number 2)-(2nd root number 3)
∴ ad = (the square of DH+the square of ah) under the root sign.
CD= 10 times the root number 2.
(Ignore unit)