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if 6,10,4 are the sides of a triangle th...

if 6,10,4 are the sides of a triangle then its obtus angle is

A

`110^(@)`

B

`120^(@)`

C

`135^(@)`

D

`115^(@)`

Text Solution

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The correct Answer is:
B
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  6. Show that (cosA)/(a)+(cosB)/(b)+(cosC)/(c)=(a^(2)+b^(2)+c^(2))/(2abc)

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  10. if 6,10,4 are the sides of a triangle then its obtus angle is

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  11. In Delta ABC , ( bc cos A + c a cos B + ab cos C) /( cot A + cot B ...

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  12. Which of the following statements is true I : If (a+b+c)(a+b-c)=ab t...

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  13. If a cos ^(2) "" (C )/(2) +c cos ^(2) "" (A)/(2) = (3b)/( 2 ) " th...

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  14. In a Delta ABC, a (cos^2 B+cos^2 C)+cos A(c cos C+b cos B)=

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  15. For any angle theta, show that a cos theta = b cos ( C + theta) +...

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  16. In DeltaBC, sum (b+c)cos=A

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  17. In triangle ABC//a(b^(2)+c^(2))cosA+b(c^(2)+a^(2))(cosB+c(a^(2)+b^(2))...

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  18. Which of the following statements is true I : In a DeltaABC if a= R...

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  19. In Delta ABC, if 3 tan ""A/2 tan""C/2=1 then a,b,c are in

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