$\"\"$

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The scalar triple product of the points:

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If the points $\"\"$ and $\"\"$ are on the same plane then the the scalar triple product of the points is zero.

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$\"\"$ .

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$\"\"$

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The points are $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ .

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Show that the points are on the same plane.

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$\"\"$ .

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$\"\"$ .

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$\"\"$ .

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Find $\"\"$ .

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$\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$ .

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Find $\"\"$ .

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The vectors are $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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Therefore, the points are on the same plane.

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$\"\"$

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The points are on the same plane.