Old school

I found a table at St. Vinnie's today (the awesome HUGE one) for twenty-five bucks! And then it turned out to be 25% off! It's an old dining table, probably from the 40's, and somebody has already apparently used it for crafting, or it was in a garage for a while, because it has paint splashed down one side of it. But there's still the pencil marks from it's (by hand) construction from so long ago, and somebody (maybe the builder) had to make a quick calculation: