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NDA 2026 · PYQ · Three Dimensional Geometry · medium

What is (PQ² + 2QS² − 2PR²) equal to?

Answer

The correct answer is B: 0. PQ² = 36 + 4 + 0 = 40. QS² = 4 + 25 + 25 = 54.

  1. A.−1
  2. B.0✓ Correct
  3. C.1
  4. D.2

Explanation

PQ² = 36 + 4 + 0 = 40. QS² = 4 + 25 + 25 = 54. PR² = 64 + 1 + 9 = 74. PQ² + 2QS² − 2PR² = 40 + 108 − 148 = 0.
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