Right triangles can have only one line of symmetry. Only right triangles with two 45 degree angles can have a line of symmetry.
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For a right isosceles triangle (45-45-90), there is one line of symmetry that bisects the hypotenuse. For all other right triangles, there are zero lines of symmetry.
A regular triangle (aka equilateral triangle) has three lines of symmetry - these are its medians, In general, a regular n-gon has n lines of symmetry.
How many lines of symmetry does an equilateral triangle have?
Six
3