Hmm. I don't remember learning about polygons in third grade. I'm not sure we learned about pi, but when we did its value was 3-1/7. Which means you had to have a firm grasp on fractions, which as I recall was in fourth grade.
What I do remember about elementary school math was the hours of mind-numbing long division and multiplication. Fortunately I had a sympathetic teacher in third grade who let me do calculations in my head rather that write everything out, otherwise I would have been poisoned on math forever. As it was, I didn't really hit my stride in math until we got into algebra and geometry in middle school. I suddenly realized I was pretty good at it, after years of hating math.
I don't know whether kids today are getting a better or worse education than we did, but I think it's great they are getting exposed to geometry early. As for "naming" polygons, that seems a bit silly but helps them learn the nomenclature for describing angles (e.g a triangle has three angles: "ABC", "BCA" and "CAB").
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