MHT CET · Maths · Vector Algebra

Let \(P, Q, R\) and \(S\) be the points on the plane with position vectors \(-2 \hat{i}-\hat{j}, 4 \hat{i}, 3 \hat{i}+3 \hat{j}\) and \(-3 \hat{i}+2 \hat{j}\) respectively. Then the quadrilateral PQRS must be a

A parallelogram, which is neither a rhombus nor a rectangle.
B square.
C rectangle, but not a square.
D rhombus, but not a square.

Verified Solution

Answer & Solution

Correct Answer

(A) parallelogram, which is neither a rhombus nor a rectangle.

Step-by-step Solution

Detailed explanation

\(\mathrm{m}_{\mathrm{PQ}}=\frac{1}{6}, \mathrm{~m}_{\mathrm{SR}}=\frac{1}{6}, \mathrm{~m}_{\mathrm{RQ}}=-3, \mathrm{~m}_{\mathrm{SP}}=-3\)

\(\square \mathrm{PQRS}\) is a parallelogram.
But neither \(\mathrm{PR}=\mathrm{SQ}\) nor \(\mathrm{PR}^{\prime} \perp \mathrm{SQ}\).
\(\therefore \quad\) Parallelogram, which is neither a rhombus nor a rectangle.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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