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when toggle format what by license comment
Mar 22, 2020 at 15:57 comment added Pierre PC I think you mean $a$ for the size of the equilateral triangle, and $x_0$ satisfies $d(x_0,T\setminus D)=20$. Very nice answer by the way, this is also how I read the OP's question.
Mar 22, 2020 at 12:55 history edited YCor CC BY-SA 4.0
added figure
Mar 21, 2020 at 23:12 history edited Todd Trimble CC BY-SA 4.0
joke perceived as possibly impolite removed
Mar 21, 2020 at 13:03 history answered YCor CC BY-SA 4.0