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Show that the points and A (-1, 4, -3), B(3,2,-5) C (-3,8,-5) D(-3,2,1)are coplanar.

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Show that the points and A (-1, 4, -3), B(3,2,-5) C (-3,8,-5) D(-3,2,1)are coplanar.

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1 Answer

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Best answer

= 4[36 + 0] + 2 [- 36 – 0] – 2[36 – 0] 

= 144 – 72 – 72 = 144 – 144 = 0 

∴ A, B, C & D arc coplanar.

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