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Assuming the question is about ROTATIONAL symmetry rather than rational symmetry, the answer is none.
It is 360 degrees divided by the order of rotational symmetry.
Because if you rotate it about its center it looks different (not symmetric) no matter what the angle is.
Kite
Yes. An isosceles triangle, for example, is symmetric about the bisector of its odd angle but has no rotational symmetry.
the line of symmetry from the middle
The square has 4 sides and has rotational symmetry of order 4. Also, the angle rotation measurement is 90 degrees.
45
None.
None. You can rotate a circle by the smallest possible angle that you can think of and it will be an angle of symmetry. And then you can halve that angle of rotation and still have rotational symmetry. And you can halve that angle ...
What is the angle of rotation of alphabet S
A "pure" trapezoid (a pair of parallel sides and two random sides) does not have rotational symmetry. If it is a parallelogram then it has a 180 degree symmetry. And if the paralloelogram happens to be a square, you have 90 deg symmetry.
Assuming the question is about ROTATIONAL symmetry rather than rational symmetry, the answer is none.
Because if you rotate it about its center it looks different (not symmetric) no matter what the angle is.
It is 360 degrees divided by the order of rotational symmetry.
Sometimes called rotation symmetry, or symmetry of rotation. If you have an object that can be turned through a certain angle (like rotating a cube through 90o) and then it looks identical, then that object has a certain symmetry under rotation. If you can turn it through any angle, like a cylinder, then it has rotation (or rotational) symmetry.