Question

The sum of the radii of inscribed and circumscribed circles for an n sided regular polygon of side a, is

• A. a cot $\left(\frac{\pi}{n}\right)$
• B. $\frac{a}{2}$ cot $\left(\frac{\pi}{2n}\right)$
• C. a cot $\left(\frac{\pi}{2n}\right)$
• D. $\frac{a}{4}$ cot $\left(\frac{\pi}{2n}\right)$

Answer 1

Answer: (B)

$\frac{a}{2}$ cot $\left(\frac{\pi}{2n}\right)$

Answer 2

Answer (b) $\frac{a}{2}$ cot $\left(\frac{\pi}{2n}\right)$