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The instrument used by surveyors to measure angles of elevation is the:

AThermodynamo
BTheodolite
CThermometer
DThermocouple
Answer & Solution
Correct answer: B. Theodolite
1. Two of the largest ever made were used in India. 2. The device measures angles for surveying. 3. It is the theodolite. _Source: syllabus Mathematics Class X, Chapter 9, Some Applications of Trigonometry._
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