VectorsVectors (id: c9efd028b)

本题目来源于试卷: VectorsVectors，类别为 IB数学

[问答题]
The position vectors of the pz4gfv 7*i4my,*kshah oints A, B 8/h pnogj/j xy0)(hh(de ozfb+ 2.qqa and C are a, b and c, respectively, relative to the orixf jj0hb/)+q (yn8h pq doh (.za2go/egin O.

$\text { Given that } \mathbf{a} \text { is perpendicular to } \overrightarrow{\mathrm{BC}} \text { and } \mathbf{b} \text { is perpendicular to } \overrightarrow{\mathrm{CA}} \text {, prove that } \mathbf{c} \text { is perpendicular to } \overrightarrow{\mathrm{AB}} \text {. }$

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