Three Dimensional Geometry Part 2

Section: Mathematics
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Question : 10 of 100
 
Marks: +1, -0
Consider a triangle ABC whose vertices are A(0,α,α),B(α,0,α) and C(α,α,0),α>0. Let D be a point moving on the line x+ z−3=0=y and G be the centroid of △ABC. If the minimum length of GD is √‌
57
2
, then α is equal to___
[30-Jun-2022-Shift-1]
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