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In a triangle ABC,r=...

In a triangle ABC,r=

A

`(s-a)tanB/2`

B

`(s-b)tanB/2`

C

`(s-b)tanC/2`

D

`(s-a)tanC/2`

Text Solution

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The correct Answer is:
B
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OBJECTIVE RD SHARMA-PROPERTIES OF TRIANGLES AND CIRCLES CONNECTED WITH THEM-Exercise
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  4. The ex-radii of a triangle r(1),r(2),r(3) are the hamonic progression ...

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  5. In any triangle A B C , prove that: a^3cos(B-C)+b^3cos(C-A)+c^3cos(A-B...

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  6. If c^2 = a^2 + b^2, 2s = a + b + c, then 4s(s-a) (s - b)(s-c)

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  7. The sides of a triangle are 13,14,15, then the radius of its in-circle...

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  8. If a cos A=b cos B , then the triangle ,is

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  9. The in-radius of the triangle whose sides are 3,5,6,is

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  10. In an equilaterial triangle of side 2sqrt3 cms, the circum-radius ,is

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  11. If the angles of a triangle are in the ratio 1:2:3,the corresponding s...

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  12. In any !ABC , (Sigma)((sin^(2)A+sinA+1)/(sinA)) is always greater tha...

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  13. In any !ABC , (Sigma)((sin^(2)A+sinA+1)/(sinA)) is always greater tha...

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  14. In a right angled !ABC sin^(2)A+sin^(2)B+sin^(2)C=

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  15. In any DeltaABC if 2 cosB=a/c ,then the triangle ,is

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  16. If in a DeltaABC ,a sin A=b sin B, then the triangle, is

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  17. In any !ABC ,If cot(A/2),cot(B/2),cot(C/2) are in A.P.,then a,b,c are...

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  18. In any !ABC b^(2)sin2C+c^(2)sin2B=

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  19. If in a triangle ABC, (cosA)/a=(cosB)/b=(cosC)/c,then the triangle is

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  20. If in a triangleABC , Delta=a^(2)-(b-c)^(2),then tan A=

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