What is the rotational symmetry of an pair of
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i think u mean: how many lines of symmetry DOES a heart HAVE and its has 1
A triangle having each of its three sides of different lengths is a scalene triangle. That would also mean there are no lines of symmetry.
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.
Rotational symmetry counts how many times a shape will fit onto itself when it is rotated 360°. When an oval (I assume you mean an ellipse) is rotated it will fit onto itself after 180°, thus it has rotational symmetry (of order 2).
If you mean "Does it have a rotational symmetry", the answer is "Yes." there is a 180 degree rotational symmetry.