It is a line that goes from one corner to another corner. See picture:
http://z.about.com/d/sewing/1/0/4/w/1/diagonal.jpg
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diagonal
An equals sign with a diagonal line through it.
it's 180 degrees so it's a straight line
If you're asking for the graph, then the function y=x would look like a diagonal line going towards the upper-right hand corner of the coordinate plane.
Answer:A line of symmetry will be a straight line usually down the middle of a figure. The line can be vertical, horizontal, or diagonal, as long as both sides of the line are mirrors of one another. Example: Ø In this circle, you can see the diagonal line through the circle, and both sides mirror one another, so the line in the circle is a line of symmetry.Answer:A line of symmetry is a line which can be drawn through something in a way that both sides are the same (and the object would look the same if reflected in a mirror)I'll draw a line of symmetry below as an example:.....|..../|\.../.|.\../..|..\./...|...\/....|....\.....|If you were to replace that line with a mirror, it would reflect one side and thus look like the triangle.Below is another example to help demonstrate what i mean by it being reflected, and both sides looking the same:.....|___..../|...../.../.|..../../..|..././...|..//....|./.....|This example is NOT a line of symmetry. If this were reflected in a mirror, it would look like a triangle, versus the shape it is.