# Sailing

Solve the following problem graphically. The fishing boat left the harbor early in the morning and set out to the north. After 12 km of sailing, she changed course and continued 9 km west. Then she docked and launched the nets. How far was she from the place of departure?

Correct result:

x =  15 km

#### Solution:

$a=12 \ \text{km} \ \\ b=9 \ \text{km} \ \\ \ \\ x=\sqrt{ a^2+b^2 }=\sqrt{ 12^2+9^2 }=15 \ \text{km}$

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