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CGP EDU Academic Team
Published on: August 14, 2026
If the length of the projection of the line segment joining the points (1,2, -1) and (3 ,5, 5) on the plane 3x - 4y + 12z = 5 is equal to d units, then the value of 169 d 2 is equal to
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3925
Let, point A be (1,2, -1), B be (3,5, 5)
If 
is the angle between the normal vector to the plane and 
then, the length of the projection = 
Normal vector = 
So, 
Length of the projection 
units
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