Geometry and TrigonometryHardDistance of a boat from its start
Geometry and Trigonometry practice question
A boat sails 20 kilometres due east and then 21 kilometres due north. How far, in kilometres, is the boat from its starting point?
Answer: 29
The two legs are perpendicular, so the distance is √(400 + 441) = √841 = 29.
Common wrong answers
- If you answered 1
- 1 subtracts them.
- If you answered 41
- 41 adds the two distances.
- If you answered 28.5
- 28.5 averages the squares wrongly.
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