# 3×3 Determinants Using Diagonals

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Copy the first two columns of the matrix to its right. Multiply along the blue lines and the red lines. Add the numbers on the bottom and subtract the numbers on the top. The result is the value of the determinant.

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Contributed by: George Beck (March 2011)

Open content licensed under CC BY-NC-SA

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"3×3 Determinants Using Diagonals"

http://demonstrations.wolfram.com/33DeterminantsUsingDiagonals/

Wolfram Demonstrations Project

Published: March 7 2011