orthodiagonal

Noun

Meaning

The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis.

Source: Webster's dictionary

normal plumb vertical perpendicular rectangular upright steep orthogonal sheer precipitous right-angled right angle plunging right-angular

level transverse flat parallel wild false

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Of all convex quadrilaterals with given diagonals, the orthodiagonal quadrilateral has the largest area. Source: Internet

In the case of an orthodiagonal quadrilateral (e.g. rhombus, square, and kite), this formula reduces to since θ is 90°. Source: Internet