10 With respect to the origin \(O\), the points \(A , B , C\) and \(D\) have position vectors given by $$\overrightarrow { O A } = \left( \begin{array} { r } 3
- 1
2 \end{array} \right) , \quad \overrightarrow { O B } = \left( \begin{array} { r } 1
2
- 3 \end{array} \right) , \quad \overrightarrow { O C } = \left( \begin{array} { r } 1
- 2
5 \end{array} \right) \quad \text { and } \quad \overrightarrow { O D } = \left( \begin{array} { r } 5
- 6