
06619303
j
2016e.00739
Glaister, P.
A proof of van Aubel's theorem using orthogonal vectors.
Int. J. Math. Educ. Sci. Technol. 47, No. 3, 440443 (2016).
2016
Taylor \& Francis, Abingdon, Oxfordshire
EN
G70
orthogonal vectors
scale triple product
vector triple product
van Aubel's theorem
quadrilaterals
doi:10.1080/0020739X.2015.1049231
Summary: We show how two linearly independent vectors can be used to construct two orthogonal vectors of equal magnitude in a simple way. The proof that the constructed vectors are orthogonal and of equal magnitude is a good exercise for students studying properties of scalar and vector triple products. We then show how this result can be used to prove van Aubel's theorem that relates the two line segments joining the centres of squares on opposite sides of a plane quadrilateral.