Not necessarily, except rotational symmetry of order 1.
a right triangle
No.
a triangle has 0 lines of symmetry.
0 lines of symmetry
caca
3
I think none. In fact the only triangle that I believe has any rotational symmetry is an equilateral triangle.
a right triangle
No.
The modern answer is that if the shape only fits once onto the original when rotated 360o it has no rotational symmetry. A right triangle only fits once when rotated 360o so it has no rotational symmetry.
None.
None.
0 lines of symmetry
a triangle has 0 lines of symmetry.
equilateral triangle
No triangle has two lines of symmetry. A right triangle and an Isoscoles triange each have one line of symmetry, and an equilateral triangle has three.
None normally but if it is a right angle isosceles triangle it will have 1 line of symmetry