Home » » A man walks 8km north and then 5km in a direction 60o east of north. Find the di...

# A man walks 8km north and then 5km in a direction 60o east of north. Find the di...

### Question

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

### Explanation:

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

R = $$\sqrt{129}$$

= 11.36km

## Dicussion (1)

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

R = $$\sqrt{129}$$

= 11.36km