Question:medium

Let A, B, C, D be the points in 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 \(◻\)ABCD is

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Compare opposite sides, then adjacent side lengths and angle.
Updated On: Oct 1, 2026
  • a parallelogram which is neither a rhombus nor a reactangle
  • a square
  • a rectangle but not a square
  • a rhombus but not a square
Show Solution

The Correct Option is A

Solution and Explanation

Step 1: Use diagonals:
Midpoint of AC: $\left(\tfrac{-2+3}{2}, \tfrac{-1+3}{2}\right) = (0.5, 1)$. Midpoint of BD: $\left(\tfrac{4-3}{2}, \tfrac{0+2}{2}\right) = (0.5, 1)$. Diagonals bisect each other, so ABCD is a parallelogram.

Step 2: Test further:
Diagonal lengths: $AC = \sqrt{25+16} = \sqrt{41}$ and $BD = \sqrt{49+4} = \sqrt{53}$. They differ, so it is not a rectangle.

Step 3: Check rhombus:
Diagonals $\overrightarrow{AC} = (5,4)$ and $\overrightarrow{BD} = (-7,2)$ have dot product $-35 + 8 = -27 \neq 0$, so they are not perpendicular, and it is not a rhombus. Option (A).

Final Answer:
It is a parallelogram only. \[ \boxed{\text{(A) }\text{Parallelogram, not rhombus or rectangle}} \]
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