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Question

A man goes 12 miles due east and then 9 miles due north. Calculate the distance travelled, if he takes the theoretically shortest path.

A
3
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B
63
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C
15
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D
21
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E
225
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Solution

The correct option is B 15
It will form a right angled triangle where one side is 12 miles and the other sides is 9 miles.
Now we know that the sum of two sides is greater the the third side.
Hence he travels 21 miles, but if he takes the shortest path then he will walk along the hypotenuse.
The length of the hypotenuse will be
=122+92=144+81=225=15

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