An equilateral triangle OAB is inscribed in the parabola y^2=4 x with the vertex O at the vertex of the parabola. Then the minimum distance of the…
JEE Main 2026 — Mathematics Coordinate Geometry
2026mcqhard
An equilateral triangle OAB is inscribed in the parabola y2=4x with the vertex O at the vertex of the parabola. Then the minimum distance of the circle having AB as a diameter from the origin is
Official previous-year question
Held on 23 Jan 2026 · Verified 6 Jul 2026.
Options
A
2(8−33)
B
2(3+3)
C
4(6+3)
D
4(3−3)
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Solution
Parabola y2=4x has vertex O=(0,0). By symmetry, let A=(t2,2t), B=(t2,−2t).
OA=tt2+4, AB=4t.
For equilateral: OA=AB⇒tt2+4=4t⇒t2=12⇒t=23.
A=(12,43), B=(12,−43).
Circle with AB as diameter: centre (12,0), radius =43.
Minimum distance from origin =12−43=4(3−3).
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