The answer depends on which letter.
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The letter U has rotational symmetry of order 1 because it looks the same after a 180-degree rotation.
The letter H has a rotational symmetry of order 2, meaning it looks the same after a 180-degree rotation.
yes, it has a rotational symmetry of 180 degrees, and of course 360. like if you flipped it upside down, then put it on top of the other one it would look the same. just not a lowercase.
Yes, it is possible to have a shape that has a line of symmetry but does not have rotational symmetry. An example is the letter "K", which has a vertical line of symmetry but cannot be rotated to match its original orientation.
what is the four letter DNA alphabet and what are the special rules by which the alphabet pieces bond together