the area of the triangle formed by the adjacent sides with A→=−3i^+2j^−4k^ and B→=−i^+2j^+k^ is
1652 units
1372 units
165 units
137 units
A→=−3i^+2j^−4k^ ; B→=−i^+2j^+k^
A→×B→=|i^j^k^−32−4−121|
=i^(2+8)−j^(−3−4)+k^(−6+2)=10i^+7j^−4k^
Area of triangle =12|A→×B→|=12102+72+42
=1652units .