Q33 of 93 Page 25

If and then verify that

Given, and


We need to verify that




First, we will find.


Recall the cross product of two vectors and is






Now, we will find.


We have




Finally, we will find.


We have




So,




Observe that that RHS of both and are the same.


Thus,


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Using vectors, find the area of the triangle with vertices

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