adjective

diagonal

diagonal

Draw a diagonal line from corner to corner.

Draw a diagonal line from corner to corner.

A square has two diagonals of equal length.

A square has two diagonals of equal length.

a diagonal ((noun)) Draw a diagonal line.

a diagonal (noun) A square has two diagonals.

slanted, oblique, sloped

From Greek 'dia-' (across) and 'gonia' (angle, corner). It means 'from angle to angle'.

Picture a line going 'across the angles' (corners) of a square. This helps remember both the adjective and noun form.

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