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Question

The area of a parallelogram whose adjacent sides are determined by the vectors a=ˆi+2ˆj+3ˆk,andb=3ˆi2ˆj+ˆk

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Solution

a=ˆi+2ˆj+3ˆk,andb=3ˆi2ˆj+ˆka×ba×b=∣ ∣ ∣ˆiˆjˆk123321∣ ∣ ∣=(2i9j2k)+(6k+6ij)a×b=8i10j++4k=64+100+16=180=45
is the Answer.

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