Sigh

I play the puzzles at YouPlay, and on each page they have a wee quiz, with a question and four options.

One I came across was "What term is given to the result of length x width of a square?"

Answers were: radius, circumference, area and rectangle (I think). There were 1360 responses for this when I took it. And the number of people with the right answer was...
80%

I also recall there was another math question (about pi being related to the circumference and radius, I think) that also had a scoring that made me depressed. This is as simple a math as you can get!

(It might have been that people misunderstood the question and went for rectangle (if indeed, that was one of the options). That's the only ray of hope I can see...)

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