There are two that I can think off of the top of my head: a rectangle and a rhombus. Answer Lots of them. The ones listed are good, but there are many others. An elipse is but one more. And these are all planar. Add a third dimension. The question does not limit the answers to things in an x-ysystem.
rectangle
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An ellipse has two lines of symmetry.
Depends on what type of shape it is. If its a diamond shaped kite then it does have 2 lines or symmetry
A triangle........I think
A line of symmetry can be thought of as the line where you could cut a shape (or a line or any object) and it would look the exact same on both sides. An example of a shape with exactly two lines of symmetry would be a rectangle. A square also has at least two lines of symmetry, but it actually has four total.
a trapezoid has a pair of symmetry lines but a square diamond or parallelogram all sides are parallel