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AreaBEF = AreaGEF and
AreaDGH = AreaEGH, then
AreaBEDG = 2AreaFEHG = 6.
AreaABE = AreaEBH = AreaHBD and
AreaCDG = AreaGDF = AreaFDB and
2Area(ABE+CDG) = Area(EBH+HBD+GDF+FDB) =
AreaBEDG = 6,
so Area(ABE+CDG) = 0,5•6=3, so
total area is equal to 9.
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