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समतलीय सदिशों की स्थिति: यदि उनका अदिश त्रिक गुणनफल शून्य है तो तीन सदिश समतलीय हैं।
माना कि
समतलीयता के लिए स्थिति:
गणना:
दिया गया है: सदिश
सदिश समान तल पर हैं इसलिए सदिश समतलीय हैं।
इसलिए,
R1 को विस्तृत करने पर, हमें निम्न प्राप्त होता है
⇒ α[0 − γ] − α[β − γ] + γ[γ−0] = 0
⇒ −αγ – αβ + αγ + γ2 = 0
⇒ γ2 = αβ
∴ α, β, γ ज्यामितीय श्रेणी में हैं।
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