# Why is it impossible to find the center of a circle with the straight edge? [closed]

The proof in 'What is mathematics' reads: 'there exists a transformation of the plane into itself which has the following properties:a)the given circle is fixed under the transformation b)any straight line is carried into a straight line c)the center of the circle is carried into some other point.

The mere exsitence of such a transformation shows the impossibility of constructing with the straightedge alone the center of the given circle. For, whatever the construction maight be, it would consist in drawing a certain number of straight lines and finding their interections with one another and with the given circle. Now if the whole figure.... is subjected to the transformation above..... it will yeild as result a point othter than the center of the given circle. Hence such construction is impossible.'

Cannot get this...... help me ww

## closed as unclear what you're asking by Eric Wofsey, José Carlos Santos, user370967, user91500, GlorfindelJul 16 '17 at 9:36

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• Did it give an example of such a transformation? – eyeballfrog Jul 16 '17 at 4:38
• What don't you understand exactly? – Eric Wofsey Jul 16 '17 at 5:57