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Q.

If h1,h2,h3 are lengths of altitudes of ΔleABC  and r is the in radius then   h1+rh1-r+h2+rh2r+h3+rh3r is 

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a

>6

b

6

c

<6

d

6

answer is A.

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Detailed Solution

h1=2Δa,h2=2Δb,h3=2Δc
h1+rh1-r=2Δa+Δs2Δa-Δs=2s+a2s-a
h1+rh1r+h2+rh2r+h3+rh3r=2s+a2sa=4s2sa3.........(1)
A.MH.M
But 4s2sa+4s2sb+4s2sc332sa4s+2sb4s+2sc4s=3
4s2sa  9
From (1)h1+rh1r+h2+rh2r+h3+rh32=4s2sa393=6

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