# 6.2  有向角及其度量

有向角實例(船隻依序從點A出發往點B，從點B出發往點C，從點C出發往點A，完成三段行程；船隻於每一段行程中在每一個位置的方位角可以說成：以該段行程之出發點為頂點，指向正北方的射線為始邊，出發點與船隻的位置之連線為終邊，依順時針旋轉所得的"負向有向角"。)

<figure><img src="/files/u1R3rrBES5h3EbeWAHLN" alt=""><figcaption><p><a href="https://www.youtube.com/watch?v=zyOziePtHG4">https://www.youtube.com/watch?v=zyOziePtHG4</a></p></figcaption></figure>

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標準位置  <https://www.geogebra.org/m/ZJ67qTRX>
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同界角<https://www.geogebra.org/m/mfxWu4kM>
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<https://www.geogebra.org/m/thkbvGRR>
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<https://www.geogebra.org/m/grerxab6>
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<https://www.geogebra.org/m/wXT42kqd>
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<https://www.geogebra.org/m/DPThhbSY>
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