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What is the area of ΔOAB, where O is the origin, 

Answer (Detailed Solution Below)

Option 4 :
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Detailed Solution

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Concept:

I. If  then 

II. If  are the adjacent sides of a triangle, then area of triangle is given by: 

Calculation:

Given: In ΔOAB, where O is the origin, 

As we know that, If  are the adjacent sides of a triangle, then area of triangle is given by: 

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