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Question

If r1,r2,r3 represent the exradius and r represents the in radius then, 1r1+1r2+1r31r = 0

A
True
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B
False
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Solution

The correct option is A True
r1=Δsa and r=Δs1r1+1r2+1r31r=saΔ+sbΔ+scΔsΔ=3s(a+b+c)ΔsΔ=3s(2s)sΔ=3s3sΔ=0
Given statement is true

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