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 what is a diagonal?

A straight line inside a shape that goes from one side to another(but not an edge). So if you join two corners of a polygon which are not already joined by an edge , you get a diagonal.

 

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A straight line inside a shape that goes from one corner to another (but not an edge).

So, if you join two corners (called "vertices") of a polygon which are not already joined by an edge, you get a diagonal.

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a diagonal is a line that joins the opposite sides of a parallelogram

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A diagonal is a line joining two nonconsecutive vertices of a polygon or polyhedron. Informally, any sloping line is called diagonal.

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