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Grade 11AIPMT

calculate the area of a parallelogram by vectors a=3i+2j. and b=-3i+7j. [the area is given by modulus of a cross b.since area is a scalar product why can”t we use a.b?]

Profile image of liza
7 Years agoGrade 11
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1 Answer

Profile image of Arun
ApprovedApproved Tutor Answer7 Years ago
Dear student
 
When we find the area of parallelogram algebraically we get the term sin theta involved hence
 
We have to use cross product