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यदि बिंदुओं A, B, C और D, के स्थिति सदिश क्रमशः \(\hat{i}+\hat{j}+\hat{k},2\hat{i}+5\hat{j},3\hat{i}+2\hat{j}-3\hat{k}\) और \(\hat{i}-6\hat{j}-\hat{k}\) हैं, तो सरल रेखाओं AB तथा CD के बीच का कोण ज्ञात कीजिए। निगमन कीजिए कि AB और CD सरेख हैं|

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यदि θ, AB और CD, के बीच का कोण है तो θ, \(\overset\longrightarrow{AB}\) और  \(\overset\longrightarrow{CD}\) के बीच का भी कोण है। अब \(\overset\longrightarrow{AB}\) = B का स्थिति सदिश – A का स्थिति सदिश.

क्योंकि 0 ≤ θ ≤ π, इसलिए θ = π है। यह दर्शाता है कि AB तथा CD एक दूसरे के सरेख हैं।

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