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I can't copy graphics, and I'm not good at drawing. You can go to the website above.

As shown in figure ∵BE∨FH∨AG.

∴∠BMF=∠MFH=∠FGO: Quadrilateral OAHF is a diamond ∴∠AFO=∠AFH=∠OAF.

∠∠mfo = 3∠bmf∠ofh =∠fbm = 2∠bmf ∴∠fgo=∠fao ∴fg=fa

∴△FGA is an isosceles triangle∴ GP = AP.

F(2 1，2)A(23，0) ∴FP=2 AP= 1 OP= 1/2

∴gp= 1 ∴og=gp-op= 1/2 ∴og=bm= 1/2