Question:
<p>If in a triangle, R and r are the circumradius and inradius respectively, then the H.M. of the exradii of the triangle is :</p>
<p style="display:inline"><span class="math-tex">\(\frac{r}{R}\)</span></p>
<p style="display:inline">3r</p>
<p style="display:inline">R + r</p>
<p style="display:inline">2R</p>
Step-by-Step Solution
Key Concept: The harmonic mean of the exradii is determined by the fundamental identity that the sum of the reciprocals of the exradii equals the reciprocal of the inradius.
<p>3r</p>
Correct Answer: B