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GATE 2019 CE (CE1) – Question 20

Geomatics Engineering · Principles of surveying: plane and geodetic surveying, errors and adjustment · 1 mark · Multiple choice

Four triangles have interior angles: P: 85°, 50°, 45°; Q: 100°, 55°, 25°; R: 100°, 45°, 35°; S: 130°, 30°, 20°. Which are ill-conditioned and should be avoided in triangulation surveys?

  1. P and R
  2. Q and R
  3. P and S
  4. Q and S

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Correct answer: (D) Q and S

Explanation

Well-conditioned triangulation avoids very acute or very obtuse angles,conventionally keeping angles between30° and120°. Q contains25° and S contains20° and130°,so both are unsuitable. P and R stay within the limits. **Answer:Q andS,D**.