△FMC∽△DME，FC: AE = 3: 10 = H 1: H 2，H 1+ H 2=8，H 1=24/ 13。
△FMC FC=3，S△FMC=36/ 13。
△FCG∽△HGA similarity ratio =3:4, and the same height PG=24/7.
S△FCG=36/7
∴s△fmg=s△fcg-s△fcm=36/7-24/7= 12/7