The y-axis is a vertical line in a two-dimensional or three-dimensional coordinate system. It is one of the two primary axes used to define positions of points. In a 3D system, it is perpendicular to the x-axis and z-axis. Points on the y-axis have x = 0 and z = 0.
Class 12 Maths Chapter 11 Three Dimensional Geometry is vital for CBSE Exam 2024-25. It includes direction cosines and direction ratios of a line equations of a line in different forms shortest distance between two lines equations of a plane angles between planes and distance of a point from a plane.
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Three-dimensional space is defined by x = 0 and z = 0 which forms the y-axis.
The distance of a point (p, q, r) from the y-axis is computed by its x and z coordinates because the y-axis does not have any displacement in the x or z direction.
Therefore, the distance is the perpendicular distance of the point from the yaxis, that is given by
√(p² + r²)
So, the correct answer is: √(p² + r²)
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