MHB I think this Aperiodical post is rather interesting

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The discussion highlights critiques of Khan Academy's approach to math education, particularly in the context of U.S. standards. Participants express concerns about the overall quality of math education in the U.S. and find value in the insights presented in the second video of the series. The conversation also speculates on how Khan Academy might differ if it were developed in Japan, suggesting cultural influences on educational methods. The critiques emphasize the need for improvement in math teaching practices. Overall, the thread reflects a critical examination of Khan Academy's effectiveness in addressing educational shortcomings.
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I've felt for a long time that math education in the US is unacceptably bad. Some goods points in this video for sure. This is the video to which CB is referring I believe.

[video=youtube;CHoXRvGTtAQ]What if Khan Academy was made in Japan?[/video]
 

Thread 'Trigonometry problem of interest'

Seemingly by some mathematical coincidence, a hexagon of sides 2,2,7,7, 11, and 11 can be inscribed in a circle of radius 7. The other day I saw a math problem on line, which they said came from a Polish Olympiad, where you compute the length x of the 3rd side which is the same as the radius, so that the sides of length 2,x, and 11 are inscribed on the arc of a semi-circle. The law of cosines applied twice gives the answer for x of exactly 7, but the arithmetic is so complex that the...
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