zero, all the keys have different letters, numbers, or symbols
ALL letters have at least one line of rotational symmetry. However - if you mean reflective symmetry, the letters F, G, J, L, P, Q, R, S, & Z do not.
H, I, O, X (I think that's all)
1 that is all
A rhombus has 2 lines of symmetry exact. :) thank you! p.s. im an expert
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.
4
not all shapes have lines of symmetry. one example is a triangle.
If your asking what shape has three lines of symmetry, your answer would be an equilateral triangle. You can tell how many lines of symmetry a shape that has all angles of the same measure has by looking at it's angles. Ex., pentagon has five angles--five lines of symmetry; octagon has eight angles, eight lines of symmetry; etc.
It depends on how many sides that it has and whether of not it is regular (all the lines of the polygon are of equal length if it is a regular polygon). For regular polygons, the number of symmetry lines is the number of sides if number of sides is an odd number. Otherwise, the number of symmetry lines is double the number of sides. A square has 4 sides and 8 symmetry lines; a triangle has 3 sides and 3 symmetry lines.
I, H, N, O, S, X & Z all have rotational symmetry.
All regular octagons have the same number of lines of symmetry, but octagons with unequal sides would have fewer lines of symmetry.