MCQ
For every point $P(x, y, z)$ on the $xy-$plane,
  • A
    $x = 0$
  • B
    $y = 0$
  • $z = 0$
  • D
    $x = y = z = 0$

Answer

Correct option: C.
$z = 0$
The $Z-$coordinate of every point on the $XY-$plane is zero.

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