本题目来源于试卷: VectorsVectors，类别为 IB数学
[问答题]
ABCD is a parallelogrh1 ne,l/ qb7p qy/pn-sam where jqqnv5mn6lco +x; gl5) z p9k+$\overrightarrow{\mathrm{AB}}=-2 \mathbf{i}-\mathbf{j}+6 \mathbf{k}$ and $\overrightarrow{\mathrm{AD}}=-4 \mathbf{i}+\mathbf{j}+3 \mathbf{k}$ .
1. Find the area of the parallelogram A B C D .
2. By using a suitable scalar product of two vectors, determine whether $A \hat{A B C}$ is acute or obtuse.
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