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When you fold a paper in half, the line that runs down the center is called the crease.
Yes, it does.
there is many ways such as using a mirror or just by looking its not hard. A triangle has 1 line of symmetry right down the biddle because when you fold it over the sides match up, its like folding paper because you can fold it portrait or landscape but you cant fold it diagonal (corner to corner)
A line has two fold rotational symetry.
You can flip the traced version along various lines. If the flipped shape matches the original then the that is a line of symmetry. Alternatively, if you can find a fold such that the two halves of the tracing match then the fold line is a line of symmetry.