All triangles are unique compared to other polygons inasmuch that they have only 3 sides and no diagonals.
If its an isosceles triangle it has 1 line of symmetry but if its an equilateral triangle it has 3 lines of symmetry
Every triangle is unique, so this question cannot have a serious answer.
Nothing. It is always possible to make a duplicate triangle.
if it has a right angle
The interior angles of a triangle sum to 180 degrees. Whether it is a right triangle or not is totally irrelevant.
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If its an isosceles triangle it has 1 line of symmetry but if its an equilateral triangle it has 3 lines of symmetry
Every triangle is unique, so this question cannot have a serious answer.
Nothing. It is always possible to make a duplicate triangle.
Any triangle has three sides, whether it is a right triangle or not.
If any one of them is longer than or equal to the sum of the other two, they can't form a triangle. If the lengths of the line segments are a, b and c, they form a triangle iff:a + b > ca + c > bb + c > a
if it has a right angle
The interior angles of a triangle sum to 180 degrees. Whether it is a right triangle or not is totally irrelevant.
It is a rigid 2-dimensional shape.
Three non-collinear points do not determine a unique spherical triangle.
Do you mean you know the lengths of the sides but you don't know the size of any of the angles ? If that's the situation, then yes. The lengths of the sides tell you everything about the triangle, and they define one and only one unique triangle. With a little bit of trig, you can figure out what the size of each angle has to be.
There are very many Triangle Parks in the world and you have not specified which one. Also, whether or not it is a triangle depends on the scale used: at the microscopic level it is almost certainly not a triangle.