A small dog walks 12 meters east and then 5 meters north. How many
meters is the dog from her starting
position?
[?] m

5 m
12 m

13m

Explanation:

North and East are perpendicular so if you illustrate this it will be a right-angle triangle;

One side will be 12 and the another will be 5;

The hypotenuse will be the desired distance;

We can use pythagoras to calculate it:

5² + 12² = x²

25 + 144 = x²

169 = x²

x = 13

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