1.

Let vecam vecvm vecc be the position vectors of the vertices A,B,C respectively of triangleABC. The vector area of triangleABC is

Answer»

`1/2 {veca XX (vecb xx VECC)+vecb xx (vecc xx veca)+vecc xx (veca xx vecb)}`
`1/2 {veca xx vecb +vecb xx vecc +vecc xx veca }`
`1/2 {veca +vecb +vecc }`
`1/2 {(vecb. vecc) veca+(vecc. Veca)vecb+(veca.vecb)vecc}`

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