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For every point p(x, y, z) on the xy-plane

For every point p(x, y, z) on the xy-plane Correct Answer z = 0

Concept:

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So for every point p (x, y, z)

on xy plane ⇒ Q (x, y, 0) ∴ z = 0

on yz plane ⇒ R (0, y, z) ∴ x = 0

on xz plane ⇒ S (x, 0, z) ∴ y = 0

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