show that the points P,Q,R and S whose position vectors are p=i+j+3k , q=4i+3j+2k r=5i+2j+7k s=6i+4j+8k are non co planar and find the volume ofthe tetrahedron formed by these four points.
2026-04-28 20:11:35.1777407095
show that below four points are non coplanar
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The volume is: $$ V=\frac{1}{6}\left| \begin{array}{cccc} 1& 1& 3& 1\\ 4& 3& 2& 1\\ 5& 2& 7& 1\\ 6& 4& 8& 1\\ \end{array} \right| $$