Apothegm or apothegm means a short, instructive saying--
The old man knew a memorable apothegm for every occasion.
"A stitch in time saves nine" is his favorite apothegm.
Apothem or apothem ( rhymes with apothegm ) means a line from the center of a regular polygon to one of its sides, perpendicular to the line that makes the side--
The apothem of an octagon is like the radius of a circle.
He has a geometry test tomorrow, and he can't remember what an apothem is.
Now that you know that, you can say--
"If you can't remember what an apothem is, just think of the old apothegm "two wrongs don't make a right".
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