A function that is symmetric with respect to the y-axis is an even function.
A function f is an even function if f(-x) = f(x) for all x in the domain of f. that is that the right side of the equation does not change if x is replaced with -x. For example,
f(x) = x^2
f(-x) = (-x)^2 = x^2
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The only shape that is symmetric about a point are a circle, sphere and their multi-dimensional counterparts. There are many more functions that are symmetric about the axes or specific lines.
symmetric about the y-axis symmetric about the x-axis symmetric about the line y=x symmetric about the line y+x=0
If the function, or channel, or whatever you are reffering to has a axis of symmetry across both the y-axis and the x-axis
symmetric nephrograms
Some triangles are symmetric, while others are not. All equilateral and isosceles triangles are symmetric.all triangles are symmetric.