it has only one line of symmetry.
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1 its from the "right angle point" on a diagonal to the center of the longest line.None normally but if it's an isosceles right angle triangle it will have 1 line of symmetry.
None.
This could be either an isosceles triangle or a right angled triangle.
1 line of symmetry.
I think none. In fact the only triangle that I believe has any rotational symmetry is an equilateral triangle.