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In Delta ABC , if AD , BE , CF are the...

In ` Delta ABC , ` if AD , BE , CF are the perpendiculars drawn from the vertices A, B, C to the opposite sides, shot that
` (1)/( AD) + ( 1)/(BE) + (1)/(CF) = (1)/ ( r ) and (ii) AD . BE. CF = ((abc) ^(2))/( 8R^(3)) =( 8 Delta ^(3))/( abc) `

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The correct Answer is:
` = ((abc) ^(2))/( 8R^(3))`
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