$$\(\quad \overrightarrow{A B}=\left(\begin{array}{r}6 \\ -1\end{array}\right) \quad \overrightarrow{B C}=\left(\begin{array}{r}-2 \\ 5\end{array}\right) \quad \overrightarrow{D C}=\left(\begin{array}{r}2 \\ -3\end{array}\right)\)$$ Find $$\(|\overrightarrow{B C}|\)$$ .............................................
Exam No：0580_w20_qp_43 Year：2020 Question No：8(a)(iii)
Answer:
\(5.39\) or \(5.385 .\).
Knowledge points:
E7.3.1 Calculate the magnitude of a vector
E7.3.2 Represent vectors by directed line segments. (In their answers to questions, candidates are expected to indicate a in some definite way
E7.3.3 Use the sum and difference of two vectors to express given vectors in terms of two coplanar vectors.
E7.3.4 Use position vectors.
Solution:
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