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If you are using lower case letters, the only letter with exactly two lines of symmetry (out of a b c d e f g h y o u j k l) is l.c and k have one line of symmetry.o has many, many lines of symmetry.H has two lines of symmetry (but lowercase h has none).A B D E Y and U all have one line of symmetry.
No, although they can be lines of symmetry, they are not the same things. If a circle were to have its center at the point (1,1), the circle would have an infinite number of lines of symmetry, but none of them would be the x or y axis.
Not many. Depending on how you write, the letters L, O, Q, and X can have diagonal lines of symmetry.
The letter O has rotational symmetry on the order of one, because after being rotated by 90 degrees, it still looks the same. Letters can also have lines of symmetry, either vertically or horizontally. Examples of letters with a vertical line of symmetry include: A, H, I, M, O, T, U, V, W, X and Y.
A, B, C, D, E, H, I, K, M, O, S, T, U, V, W, X, Y all have at least one line of symmetry.