the term that describes a function that is symmetric about the y-axis is
Even and odd functions Geometrically speaking, the graph face of an even function is symmetric with respect to the y-axis, meaning that its graph remains unchanged after reflection about the y-axis.
Quadrant (plane geometry) These are often numbered from 1st to 4th and denoted by Roman numerals: I (where the signs of the (x,y) coordinates are (+,+)), II (−,+), III (−,−), and IV (+,−). When the axes are drawn according to the mathematical custom, the numbering goes counter-clockwise starting from the upper right ("northeast") quadrant.