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Maths-

General

Easy

Question

A circle touches two of the smaller sides of a ABC (a < b < c) and has its centre on the greatest side. Then the radius of the circle is -

$\frac{a - b - c}{2}$
$\frac{a b c}{2}$
$\frac{2 Δ}{a + b}$
none of these

The correct answer is: $fraction numerator 2 capital delta over denominator a plus b end fraction$

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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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parallel

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parallel

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parallel

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