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It has y-axis symmetry. anyfunction with only x^2 and its coefficient has y-axis. These are called even fuctions. Therefore, it also might be called evensymmetry.
Not necessarily, in fact, only parallelograms have them, irregular quadrilaterals do not.
A letter I i.
no, only single digit numbers are 8,3,1, and 0
There are 11 letters with only one line of symmetry.