If its an isosceles triangle it has 1 line of symmetry but if its an equilateral triangle it has 3 lines of symmetry
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Same length, same width, same size, same shape
A figure has rotational symmetry if you can turn it about a figure.
All triangles are unique compared to other polygons inasmuch that they have only 3 sides and no diagonals.
if it has a right angle
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)