It usually means a straight line going from one vertex of a polygon, polyhedron (or a shape in more dimensions) to another vertex.
More generally any line between the 'X' or 'Y' axes on a graph
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Question: In figure, what is the ratio of the areas of a circle and a rectangle if the diagonal of rectangle is equal to diameter of circle.
Diagonal means across at an angle, not horizontal or vertical.
Diagonal means a line that is not vertical or horizontal, but in between. i.e. / or \
If you mean a zero with a diagonal line through it, it is the symbol for the empty set which is the set that contains nothing.
Diagonal is the comunication betwwen the person in which it is used to exchange informtion gastures expressions and etc,,,
A expression in maths is a collection of terms without an equality sign.