
(exaggerated/not to scale)
Ok so as I understand it the left scenario is happening - an "illusion" of a taper, as the sides are not decreasing.
On the right would be both a taper, and increase in radii.
Quote:
ta·per
ˈtāpər/Submit
verb
1.
diminish or reduce or cause to diminish or reduce in thickness toward one end.
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The thickness isn't actually changing, so no taper.