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उस समतल का समीकरण ज्ञात कीजिये जो बिन्दु `hati+hatj+hatk` से होकर जाता है और जो सदिश `-3hati+4hatj-7hatk` तथा `2hati+9hatk` के समान्तर है।

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माना तीन बिन्दु उनके जिनके स्थिति-सदिश क्रमशः `veca, vecb` तथा `vecc` है।
`veca=hati+hatj+hatk,vecb=-3hati+4hatj-7hatk` तथा `vecc=2hati+9hatk`
सूत्र `vecr=veca+tvecb+svecc` से समतल का समीकरण
`vecr=hati+hatj+hatk+t(-3hati+4hatj-7hatk)+s(2hati+9hatk)`

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