No.
Some of the classic curves studied by mathematicians: ellipses, hyperbola are cross sections of a cone taken at an angle.
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If horizontal, a circle. If vertical, a semi-circle.
The vertical cross sections are trapezia or triangles. The horizontal cross sections are rectangles which are mathematically similar to the base.
It is a rectangle which is similar to the base.
Christian Cross: 1 - Vertical symmetry Maltese Cross: 4 - Vertical, Horizontal and two diagonals
Circle