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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?]

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?]

Grade:11

1 Answers

Arun
25758 Points
4 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

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