Peru2009 447.jpg
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§
§ The perimeter is p=3a\,\!
§ The radius of the <http://en.wikipedia.org/wiki/Circumscribed_circle>
circumscribed circle is R=a\frac{\sqrt{3}}{3}
§ The radius of the <http://en.wikipedia.org/wiki/Inscribed_circle>
inscribed circle is r=a\frac{\sqrt{3}}{6}
§ And the <http://en.wikipedia.org/wiki/Altitude_(triangle)> altitude is
h=a\frac{\sqrt{3}}{2}.
I had thought the newer trains with the better lighting and clear-sounding announcements would have fixed this. But no, just the same of the old.
One can easily argue that the sign above on the platform is sufficient. But anyone who has been in New York for more than a week can tell you that trains frequently change routes, which is another point of grievance by subway riders.
Is it so costly to add to short words, "to" and "from" to the sign? Perhaps it is too taxing on a non-thinking mind.
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