1.

Calculate the area of the triangle ABC (by vector method) where A(1,1,2), B(2,2,3), C(3,-1,-1)

Answer»

Solution :

=`-hati+5hatj-4hatk`
Area of `TRIANGLE ABC`
=`1/2 sqrt(1+25+16) = sqrt(42)/2` SQ. UNITS.


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