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# SirPls prove that the vector area of a triangle whose vertices are a vector bvector and cvector is0.5(bvec cross cvector +cvector cross a vec+ a vector cross b vector)Thanks and Rgds,Jai bharat bajaj IIT Delhi
7 years ago

Let A be the endpoint of , B be the endpoint of vector , and C be the endpoint of vector .

Then the vector from A to B is , and the vector from A to C is .

So (1/2) | X| is the area of the triangle. ( magnitude of the cross-product is equal to the area of the parallelogram determined by the two vectors, and the area of the triangle is one-half the area of the parallelogram.)

(B-A) X(C-A) = B X C - B X A - A X C + A X A

The cross product of a vector with itself is zero, and A X B = – B X A, so(B-A) X (C-A) = B X C + A X B + C X A

which means that(1/2) | (B-A) X (C-A) | = (1/2) | B X C + A X B + C X A | = area of the triangle.

Thanks & Regards

Bharat Bajaj

IIT Delhi Sumit Majumdar IIT Delhi
7 years ago
Dear student,
Let the vertices be given by the vectors:
So, the area would be given by:
Regards
Sumit