1.
If the position vectors of the vertices of △ABC\triangle ABC are OA→=3i^+j^+2k^\overrightarrow{OA} = 3\hat{i} + \hat{j} + 2\hat{k}, OB→=i^+2j^+3k^\overrightarrow{OB} = \hat{i} + 2\hat{j} + 3\hat{k} and OC→=2i^+3j^+k^\overrightarrow{OC} = 2\hat{i} + 3\hat{j} + \hat{k}, then the length of the altitude of △ABC\triangle ABC drawn from A is