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Maths-

General

Easy

Question

Sum of the radii of the circles, which are respectively inscribed and circumscribed about a regular polygon of n sides is -

$\frac{a}{2} \sin \frac{π}{4}$
$\frac{a}{2} \cot \frac{π}{n}$
$\frac{a}{2} \sin \frac{π}{n}$
$\frac{a}{2} \cot \frac{π}{2 n}$

The correct answer is: $fraction numerator a over denominator 2 end fraction cot invisible function application fraction numerator pi over denominator 2 n end fraction$

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$open parentheses fraction numerator 1 over denominator r end fraction minus fraction numerator 1 over denominator r subscript 1 end subscript end fraction close parentheses open parentheses fraction numerator 1 over denominator r end fraction minus fraction numerator 1 over denominator r subscript 2 end subscript end fraction close parentheses open parentheses fraction numerator 1 over denominator r end fraction minus fraction numerator 1 over denominator r subscript 3 end subscript end fraction close parentheses$ =

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Physics-General

parallel

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