[線代] find the area

[TampaBayRays (坦帕灣光芒)]

Find the area of the triangle in R3 with vertices (-1,2,3),(0,1,4),(2,1,5)

[Hint:Think of the vectors emanating from (-1,2,3).The triangle may be view

as half a parellelogram]

請問要怎麼算??

謝謝!!

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