NCERT Miscellaneous Exercise Q10 - Vector Algebra
Question: Adjacent sides of a parallelogram are 2i-hat-4j-hat+5k-hat and i-hat-2j-hat-3k-hat. Find a unit vector parallel to a diagonal, and the area.
Answer: (3 i-hat - 6 j-hat + 2 k-hat)/7; area = 11 sqrt(5).
Full step-by-step NCERT solution with diagrams on Something by Zero.