Question 1141765
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If somebody familiar with Math will read it 


<pre>
    "the radius of a square is . . . ", 
</pre>

he &nbsp;(or she) &nbsp;can lose consciousness.




So, be careful when you formulate your thoughts . . . (!)



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Dear Edwin, I saw your notice.


In response, I only can say, that at such education method, the students soon will not be able 
to distinct a square from a circle and a diameter from a diagonal.


There is a film / ( a movie) &nbsp;"Idiocracy" &nbsp;exactly about such style of life and such style of education / (of teaching).



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Next Alan tries to disprove me and to teach me in his post . . . 



Dear colleagues, leave these attempts - I know Geometry from &nbsp;"a" &nbsp;to &nbsp;"Z", &nbsp;along and across, &nbsp;in deep and in wide . . . 


Regarding terminology, &nbsp;for regular polygons there are the terms 


<pre>
    "the radius of the inscribed circle"  and  "the radius of the circumscribed circle" 
</pre>

- and there is &nbsp;<U>NO &nbsp;NEED</U>&nbsp; to invent other / (new) terms to replace / (to substitute)  just existing.



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In this site, &nbsp;you have this free of charge online textbook on Geometry

&nbsp;&nbsp;&nbsp;&nbsp;<A HREF=https://www.algebra.com/algebra/homework/Triangles/GEOMETRY-your-online-textbook.lesson>GEOMETRY - YOUR ONLINE TEXTBOOK</A> 

written &nbsp;<U>by &nbsp;me</U>.


Save the link to this online textbook together with its description


Free of charge online textbook in GEOMETRY
https://www.algebra.com/algebra/homework/Triangles/GEOMETRY-your-online-textbook.lesson


to your archive and use it when it is needed <<<------->>>  &nbsp;TO &nbsp;REFRESH &nbsp;YOUR &nbsp;KNOWLEDGE &nbsp;in &nbsp;GEOMETRY.



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OK, &nbsp;today is the day when I teach &nbsp;(&nbsp;= I should teach) &nbsp;my colleagues - tutors.


In Geometry, &nbsp;there is no such a term - "radius of a square".



<pre>
    Only totally illiterate in Geometry can use this term.

    // (Despite of millions links from Google.)
</pre>


There is the term &nbsp;"the radius of the circle circumscribed around a square", &nbsp;&nbsp;INSTEAD.



This is written for tutor&nbsp; @MathTherapy, &nbsp;personally.