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Whose face is the shape on the left?
cylinder

Seen from the left, a cylindrical object is a rectangle (also called rectangle).

This is a three-view problem of junior high school mathematics: a three-dimensional figure, which can be clearly described by front view (front view), left view (left view) and top view (top view). This is also the principle of three-dimensional scanning. So this question, viewed from the left of the cylinder, is only part of the three views.