In addition, in algebra, n-order determinant, the numbers from upper left to lower right belong to the main diagonal, and the numbers from upper left to upper right belong to the sub-diagonal. The word "diagonal" comes from the relationship between "angle" and "angle" in ancient Greek, and was later drawn into Latin ("diagonal").
Application of extended data diagonal
(1) A quadrilateral whose diagonals bisect each other is a parallelogram.
(2) A quadrilateral whose diagonal is bisected and equal is a rectangle.
(3) The diagonal is bisected and the vertical quadrilateral is a diamond.
(4) A quadrilateral with equal diagonal and median vertical is a square.
(5) A trapezoid with equal diagonals is an isosceles trapezoid.
(6) brace the beam of rectangular structure (such as scaffold) in engineering to bear the force pushed into it; Although it is called diagonal, for practical reasons, diagonal is usually not connected with the corners of a rectangle.
(7) diagonal pliers refers to the wire cutters defined by the cutting edge of the blade, which intersect with the joint rivet at a certain angle or form a "diagonal line", hence the name.
(8) Diagonal binding is a binding used to combine spars or rods together so that the belt passes through the rods at an angle.
(9) In football match, diagonal control tactics are that referees and assistant referees position themselves in one of the four quadrants of the court.
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