I think it's because the circle is intuitive to you, but other likely commonly guessed shapes are probably rectangles and stars. So like, from there you're fac

I think it's because the circle is intuitive to you, but other likely commonly guessed shapes are probably rectangles and stars. So like, from there you're faced with "well, OK given any polygon how do I calculate the area", and then "without measuring the area, how can I say that one polygon has a greater area than another" All of that is pretty tricky IMO. I think if you took your average SWE and asked them to work this out, they'd either google it or futz around in a buffer for a couple hours. To me that means "too hard for your average 15-16 year old", although maybe the US has super lowered my standards.