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Triangle at the close end                             (1/2) • 6 • 8    =   24 

Triangle at the far end                                 (1/2) • 6 • 8    =   24 

The end opposite the point                                    6 • 12  =   72 

The side you can see                                             8 • 12  =   96 

The side you can't see                                         10 • 12  =  120

 

Add them up                                                                           336 square feet