Surely there aren't any teachers who don't know what pi is? That is very scary. I see why he would keep his mouth shut - it is hard to answer a question and be told you answered it wrong.

I really doubt there are that many kids in his class with IQs 151 or above. Sure it may be a skewed sample but even so it is unlikely. They could have a number of MG kids and be lumping them all together I suppose.