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In a triangle A B C ,\ C D is the bisect...

In a triangle `A B C ,\ C D` is the bisector of the angle `Cdot` If `cosC/2` has the value `1/3` and `l(C D)=6,` then `(1/a+1/b)` has the value equal to `1/9` (b) `1/(12)` (c) `1/6` (d) none

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ALLEN-SOLUTION AND PROPERTIES OF TRIANGLE-All Questions
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  2. If cos A+cos B+2cos C=2 then the sides of the A B C are in A.P. (b) G...

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  3. In a triangle A B C ,\ C D is the bisector of the angle Cdot If cosC/2...

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  4. The medians of a A B C are in 9c m ,\ 12 c m\ a n d\ 15 c m respectiv...

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  5. If ' O ' is the circum centre of the A B C and R1,\ R2,\ R3 are the r...

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  6. Two rays emanate from the point A and form an angle of 43 with one a...

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  8. The value of (cosA)/(P1)+(cosB)/(P2)+(cosC)/(P3) is

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  14. Prove that r1+r2+r3-r=4R

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  15. In a Delta ABC, GA,GB,GC makes angles alpha, beta, gamma with each oth...

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  16. In a DeltaABC, the median to the side BC is of length 1/sqrt(11-6sqrt...

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  17. Prove that : (r1)/(b c)+(r2)/(c a)+(r3)/(a b)=1/r-1/(2R)

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  18. Prove that : (tanA/2)/((a-b)(a-c))+(tanB/2)/((b-a)(b-c))+(tanC/2)/((c-...

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  19. Prove that in a triangle (b c)/(r1)+(c a)/(r2)+(a b)/(r3)=2R\ [(a/b+b...

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  20. In a triangle, if the angles A , B ,a n dC are in A.P. show that 2cos1...

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