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CGP EDU Academic Team
Published on: August 14, 2026
Let P be a point in the first octant, whose image Q in the plane x + y = 3 (that is, the line segment PQ is perpendicular to the plane x + y = 3 and the mid-point of PQ lies in the plane x + y = 3) lies on the z-axis. Let the distance of P from the x-axis be 5. If R is the image of P in the xy-plane, then the length of PR is _____ .
Text Solution
Verified by ExpertsThe correct answer is:
8
(8)
Let Q 
(0, 0, z 1 ) then P is image of Q in x + y = 3
(3) 2 + 
= 25 
z 1 =4
Length of PR = 2 z 1 = 8
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