Backslash
It is sometimes called the back-slash.
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If you had a circle and you halved it, exactly in the middle, then that line would be a line of symmetry! And it is the same with a square. If you halve it exactly in the middle then that would be called a line of symmetry! And then all the lines of symmetry in a square are down, across, diagonal from the left and then diagonal from the right! But in a circle there are LOTS of lines of symmetry!
Diagonal.
A diagonal.
A diagonal is a line so the area of any diagonal must be zero.
diagol lines a slanted linesA diagonal line is a lines which is a slanted line