What is the length of foot of perpendicular drawn from the point P (3, 4,5) on Y-axis?

What is the length of foot of perpendicular drawn from the point P (3, 4,5) on Y-axis?

  1. A

    41

  2. B

    34

  3. C

    5

  4. D

    None of these

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    Solution:

    When we drawn perpendicular from the point P(3, 4,5) on Y-axis, the r and e-coordinates will be zero and
    y-coordinate will be 4. 

    i.e., coordinate on Y-axis Q(0, 4, 0).
    .'. Distance between P and Q = PQ

    =(30)2+(44)2+(50)2=32+02+52=9+25=34 units 

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