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D, E, F त्रिभुज ABC की भुजाओं के मध्य बिन्दु है दिखाइये कि किसी बिन्दु O के लिए सदिश
`vec(OA)+vec(OB)+vec(OC)=vec(OD)+vec(OE)+vec(OF)`

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`vec(OD)=(1)/(2)(vec(OC)+vec(OB)),vec(OE)=(1)/(2)(vec(OC)+vec(OB)),vec(OF)=(1)/(2)(vec(OA)+vec(OB))`
तब `vec(OD)+vec(OE)+vec(OF)`
`=(1)/(2)(vec(OB)+vec(OC))+(1)/(2)(vec(OC)+vec(OA))+(1)/(2)(vec(OA)+vec(OB))=vec(OA)+vec(OB)+vec(OC)`

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