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Transformations of the plane
Transformation of the plane is called a process f , which assigns to every point X of the plane, with a possible exception of some special points,...
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Circle measurement
The problem with the circle is, that before measuring it, one has to prove that it has length, called perimeter). This appears difficult to...
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Transformations in space
Transformations in space, analogously to those on the plane (§ 2.1), are processes through which to every point X of space corresponds another point...
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Solids
To the notion of the dihedral corresponds, in plane geometry, that of the usual angle. This is emphasized also with the next definition which gives...