How about a solution with almost no math...
I imagine every trucker in the world knows how many gallons his tank holds. If not, it's easy enough to look up.
Divide the total capacity by 4. Add that much to the tank and measure it with the stick.
Nice and easy, only one simple division. There's always an easier way. [img]/forums/images/icons/smile.gif[/img] I doubt this is the solution Jim was looking for, but I like it a lot more than the calc and trig.
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