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=1/2AE*BE+1/2DF*FC+1/2(FC+BE)*EF
=1/2(AF-EF)*BE+1/2(ED-EF)*FC+ 1/2(FC+BE)*EF
=1/2AF*BE-1/2EF*BE+1/2ED*FC-1/2EF*FC+1/2FC*EF+1/2BE*EF
=1/2AF*BE+1/2ED*FC
=1/2(AF*BE+ED*FC)
=1/2(14*8+12*6)
=56+36
=92
=1/2(AF-EF)*BE+1/2(ED-EF)*FC+ 1/2(FC+BE)*EF
=1/2AF*BE-1/2EF*BE+1/2ED*FC-1/2EF*FC+1/2FC*EF+1/2BE*EF
=1/2AF*BE+1/2ED*FC
=1/2(AF*BE+ED*FC)
=1/2(14*8+12*6)
=56+36
=92
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