A man walks 8km north and then 5km in a direction 60o east of north. Find the distance from his starting point
-
11.36km
- 12.36km
- 13.00km
- 14.36km
The correct answer is: A
Explanation
R = \(\sqrt {5^2 + 8^2 - 2 \times 5 \times 8 \times cos 120^o}\)R = \(\sqrt{129}\)
= 11.36km