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If r(1), r(2) ,r(3) are the ex-radii of ...

If `r_(1), r_(2) ,r_(3)` are the ex-radii of `DeltaABC,` then prove that
`(bc)/(r_(1))+(ca)/(r _(2))+(ab)/(r _(3))=2R [((a)/(b)+(b)/a)+((b)/(c)+(c)/(b))+((c)/(a)+ (a)/(c))-3]`

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ALLEN-SOLUTION AND PROPERTIES OF TRIANGLE-All Questions
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  2. Prove that r1+r2+r3-r=4R

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  9. about to only mathematics

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  10. If A,A1,A2 and A3 be respectively the areas of the inscribed and escri...

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  11. The value of 1+cot ^2A is

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  15. Let a, b, c be the sides of a triangle . No two of them are equal and ...

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  16. If in a triangle of base 'a', the ratio of the other two sides is r ( ...

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  17. If the bisector of the angel C of a triangle ABC cuts AB in D and the ...

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  18. If Delta is the area of a triangle with side lengths a, b, and c, then...

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  19. Which of the following pieces of data does NOT uniquely determine an ...

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  20. If In is the area of n sided regular polygon inscribed in a circle of ...

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