1.

If A, B, C, D are four points in a space and |AB×CD+BC×AD+CA×BD|=λ(area of the triangle ABC). Then the value of λ is

Answer»

If A, B, C, D are four points in a space and |AB×CD+BC×AD+CA×BD|=λ(area of the triangle ABC). Then the value of λ is




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