No.
Not necessarily, except rotational symmetry of order 1.
yes * * * * * Usually, no. Only isosceles right angled triangles have a line of symmetry.
a right triangle
It can have, but only if the two smaller angles are 45 degrees, then there is symmetry about the centre-line.
A shape that has no lines of symmetry, two right angles, and one acute angle is a right-angled triangle that is not isosceles. This triangle can have its right angles positioned in such a way that the overall shape lacks any symmetry. The acute angle ensures that the triangle does not conform to typical symmetrical properties. Thus, the right-angled triangle fits the criteria specified in your question.
None.
None.
I think none. In fact the only triangle that I believe has any rotational symmetry is an equilateral triangle.
3
Not necessarily, except rotational symmetry of order 1.
yes * * * * * Usually, no. Only isosceles right angled triangles have a line of symmetry.
a right triangle
A scalene triangle that is not right angled.
None normally but if it is a right angle isosceles triangle it will have 1 line of symmetry
it has only one line of symmetry.
This could be either an isosceles triangle or a right angled triangle.
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.