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.
I think none. In fact the only triangle that I believe has any rotational symmetry is an equilateral triangle.
An equilateral triangle has both line symmetry and rotational symmetry. A non-equilateral isosceles triangle has line symmetry but not rotational symmetry. A scalene triangle has neither kind of symmetry.
None.
Yes, an equilateral triangle has rotational symmetry of order 3.
yes it does. It a rotational symmetry of 3
Not necessarily, except rotational symmetry of order 1.
I think none. In fact the only triangle that I believe has any rotational symmetry is an equilateral triangle.
a right triangle
No.
None.
An equilateral triangle has both line symmetry and rotational symmetry. A non-equilateral isosceles triangle has line symmetry but not rotational symmetry. A scalene triangle has neither kind of symmetry.
An isoceles triangle does not have rotational symmetry.
Only an equilateral triangle has rotational symmetry.
None.
Yes, an equilateral triangle has rotational symmetry of order 3.
An equilateral triangle has rotational symmetry (order 3).
It is an equilateral triangle which has rotational symmetry