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Question
Find the value of θ if cos θ = 0.6763
Sum
Solution
| 0' | 6' | 12' | 18' | 24' | 30' | 36' | 42' | 48' | 54' | Mean difference | ||||||||
| 0.0° | 0.1° | 0.2° | 0.3° | 0.4° | 0.5° | 0.6° | 0.7° | 0.8° | 0.9° | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
| 49 | 0.7547 | |||||||||||||||||
cos θ = 0.6763
= 0. 6769 – 0.0006′
= 47° 24′ + 3′
= 47° 27
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Chapter 6: Trigonometry - Exercise 6.4 [Page 239]
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