Kinematics Question 436

Question: The vectors from origin to the points A and B are A=3i^6j^+2k^ and B=2i^+j^2k^ respectively. The area of the triangle OAB be

Options:

A) 5217squnit

B) 2517squnit

C) 3517squnit

D) 5317squnit

Show Answer

Answer:

Correct Answer: A

Solution:

[a] Given OA=a=3i^6j^+2k^

and OB=b=2i^+j^2k^

(a×b)=|i^j^k^362212| =(122)i^+(4+6)j^+(3+12)k^ =10i^+10j^+15k^

|a×b|=102+102+152

=425=517

Area of ΔOAB=12|a×b|=5172sq. unit



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