Sailing

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

Correct answer:

x =  15 km

Step-by-step explanation:

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

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