Neco 2021 Mathematics Question 27
Practice objective / multiple choice question 27 from the 2021 Neco Mathematics examination.
In a plane, vectors \(\mathbf{a}\) and \(\mathbf{b}\) satisfy \(|\mathbf{a}| = 5\) and \(|\mathbf{b}| = 8\). Define \(\mathbf{c} = 2\mathbf{a} - \mathbf{b}\). If \(\mathbf{c}\) is perpendicular to \(\mathbf{a} + \mathbf{b}\), find the angle between \(\mathbf{a}\) and \(\mathbf{b}\) in degrees (to the nearest degree).
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About This Question
This is Neco 2021 Mathematics Question 27. It is one of the objective questions from the 2021 Neco Mathematics examination.
Difficulty level: Hard .
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