A ship leaves port P and sails 12 km due north, then 5 km due east. How far is it from P?
Answer and explanation
Correct answer: C. 13 km
- Step 1: The two legs are at right angles, so use Pythagoras. Step 2. Distance = root(144 + 25) = root 169 = 13 km. Answer: 13 km. Why not the others: 17 km: That adds the two distances instead of using Pythagoras. 7 km: That subtracts the distances. 60 km: That multiplies the two distances.
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