While this is true, they were still able to build pretty significant things without such accuracy. Sure, if you keep rounding you can lose essence but rounding pi to 3 doesn't lose enough of the essence for practical usefulness. 3 works fine rough circles..it might not work fine for building a rocket or a some finer piece of machinery but for may things it works fine.

Besides, although I said what I did to make a valid point, I mostly said it to be humorous. Sorry I did not put in the humor tags.