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If an object is symmetrical, it means that both sides are equal in size. In the word WHISPER, the letter H and the letter W both have symmetrical sides.
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I can see two possible answers to this question:There exists no three-dimensional object with only two sides.Picture a two-dimensional circle. Now put it in the third dimension and inflate the center of it a little bit. It would be like a coin, but the edges of both sides converge to a single edge. This may or may not count as a "three-dimensional object with two sides," depending on various possible definitions of the words in that phrase.
A face is the flat surface of an object (2 or 3 dimensional). An edge is when two sides (faces) meet on an object. A vertex is the corner of an object, where an angle exists between two or more lines.
a piece of paper is a 3D object it has a front and back face + two side edges + a top and bottom edge = 6 sides a piece of paper has 6 sides