



 
Hi David, I think the attic looks something like the diagram below. If so the volume is $\large \frac12 \normalsize 10 \times 8 \times \large \frac{7}{12} \normalsize = 23 \large \frac13 \normalsize \mbox{ cubic feet.}$ If I have the incorrect shape write back, preferably with a diagram. Penny  


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