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Can a chair be symmetric?
Yes, most of them are as if you cut the chair in half both pieces will be mirror image of each other.* * * * *True, but that is a kind of tautological answer. It does not work if you cut it in two along a vertical plane parallel to the back: one part will have the front legs and a bit of the seat while the other will have the back legs, rest of the seat and the back. Not a mirror image. It will work, but only if the chair is cut by a vertical plane that is perpendicular to its back.
Does a rectangular prism have plane symmetry or symmetry about an axis?
I believe it has both. If you draw planes through the middle of opposite sides e.g. top/bottom, left side/right side, front/back, you will get three planes of (refection) symmetry. Also if you draw three lines through those same points, you will get three axes of (rotational) symmetry.
What is length and breadth?
Length and Breath are terms used in golf. Length is the longevity of your swing, back to front. Breath is your breathing pattern during a swing, which should be kept constant.
Two lines in the same plane are if they have no common points?
They can be but need not be. They could be parallel lines which, between them define a plane. Or they could be non-parallel, non-intersecting lines. Imagine yourself in a cuboid room with your back to a wall. Consider the line (A) formed by the wall behind you and the wall to your right. Consider the line (B) formed by the floor and the wall opposite you. The lines A and B have no point in common butthey are not coplanar.
What can you do to make a 3D pie chart stand out from the rest?
3D pie charts are not a good idea because most people are not very good at adjusting for the perspective difference between the front and the back of the pie.
