All triangles are unique compared to other polygons inasmuch that they have only 3 sides and no diagonals.
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If its an isosceles triangle it has 1 line of symmetry but if its an equilateral triangle it has 3 lines of symmetry
Every triangle is unique, so this question cannot have a serious answer.
Nothing. It is always possible to make a duplicate triangle.
if it has a right angle
The interior angles of a triangle sum to 180 degrees. Whether it is a right triangle or not is totally irrelevant.