The vectors from origin to the points A and B are 
and 
respectively, then the area of triangle OAB is
Given that, vector from origin to the point A, 
and vector from origin to the point B, 
.
Area of Δ OAB = 
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The vectors from origin to the points A and B are and respectively, then the area of triangle OAB is
Given that, vector from origin to the point A, and vector from origin to the point B, .
Area of Δ OAB =
=
=
=
=
=
=
=