If r is the radius of the inscribed circle of a regular polygon of n sides, each of length a, then r is equal to

JEE Main Mathematics question

Not in JEE syllabus

If is the radius of the inscribed circle of a regular polygon of sides, each of length , then is equal to

Answer: (B)

The inradius of a regular polygon is the apothem: half the side divided by . Each side subtends

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Question ID VK-008445