JEE MATHEMATICS MCQ: PROPERTIES OF TRIANGLES

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Analyzing +4 | -1

A triangle be such that

\cos 2 A+\cos 2 B+\cos 2 C

is minimum. If in radius of the triangle is 3, then which of the following is CORRECT?

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Correct option: B

Perimeter of

\Delta

18 \sqrt{3}

Units

Option B (Perimeter of

\Delta

18 \sqrt{3}

Units) is correct because when

\cos 2 A+\cos 2 B+\cos 2 C

is minimum, the triangle is equilateral, and the perimeter can be calculated using the inradius.

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