Explanation:
Path forms a right-angled triangle with sides 15 km (East) and 8 km (South). Shortest distance = √(15² + 8²) = √(225 + 64) = √289 = 17 km.
Explanation:
North (0°) -> SW (225°) is 225° shift? Actually SW is 225°, difference 225° clockwise. Apply same to SE (135°): 135°+225°=360°=0° North. So North.
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