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A man walks 8km north and then 5km in a direction 60o

A man walks 8km north and then 5km in a direction 60o east of north. Find the distance from his starting point

A.

11.36km

B.

12.36km

C.

13.00km

D.

14.36km

View answer & explanation

Correct answer is A

R = \(\sqrt {5^2 + 8^2 - 2 \times 5 \times 8 \times cos 120^o}\)

R = \(\sqrt{129}\)

= 11.36km

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