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9 results for “diagonal”

Formulae (9)

A = \frac{1}{2} d_1 d_2

Area from the two diagonals of a rhombus.

A = \frac{1}{2} d_1 d_2

Area from the two diagonals of a kite.

d = a\sqrt{2}

Length of the diagonal of a square.

d = \sqrt{l^2 + w^2}

Length of the diagonal of a rectangle.

d = \sqrt{l^2 + w^2 + h^2}

Longest diagonal through a rectangular box.

D = \frac{n(n-3)}{2}

Count of diagonals in an n-sided polygon.

\text{tr}(A) = \sum_i a_{ii}

Sum of the diagonal entries of a square matrix.

(A^T)_{ij} = a_{ji}

Reflects a matrix across its main diagonal.

\text{tr}(A) = \sum_i a_{ii}

Sum of the diagonal entries of a square matrix.