If a, b, c are position vector of vertices of a triangle \[ABC\], then unit vector perpendicular to its plane is [RPET 1999]

\[\frac{a\times b}{|a\times b|}\]

\[a\times b+b\times c+c\times a\]

\[\frac{a\times b+b\times c+c\times a}{|a\times b+b\times c+c\times a|}\]

If a, b, c are position vector of vertices of a triangle \[ABC\], then

1.	If a, b, c are position vector of vertices of a triangle \[ABC\], then unit vector perpendicular to its plane is [RPET 1999]
A.	\[a\times b+b\times c+c\times a\]
B.	\[\frac{a\times b+b\times c+c\times a}{\|a\times b+b\times c+c\times a\|}\]
C.	\[\frac{a\times b}{\|a\times b\|}\]
D.	None of these
Answer» C. \[\frac{a\times b}{\|a\times b\|}\]

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If a, b, c are position vector of vertices of a triangle \[ABC\], then unit vector perpendicular to its plane is [RPET 1999]

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