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If the anngle A,B,C of a Delta ABC are ...

If the anngle A,B,C of a `Delta ABC ` are in A.P then :-

A

`c^2=a^2+b^2-ab`

B

`b^2=a^2+c^2-ac`

C

`c^2=a^2+b^2`

D

none of these

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The correct Answer is:
B
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ALLEN-Solutions of Triangle & Binomial Theorem-EXERCISE-I
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  2. In Delta ABC if a= 16 , b= 24 and c = 20 then cos B/2

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  3. If the anngle A,B,C of a Delta ABC are in A.P then :-

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  4. In a Delta ABC b= sqrt(3)+1, c=sqrt(3)-1 , angle A = 60 ^@ then the v...

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  5. In any Delta ABC the value of 1-tan""B/2 tan""C/2 is equal to :-

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  6. If c^2=a^2+b^2,2s = a+b+c , then 4 Delta ^2=

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  7. If in a Delta the ex-reddii (r(1) r(2) r(3) are in the ratio 1:2:3 t...

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  8. If in a triangle (r(2)- r(1))(r(3)-r(1))=2r(3)r(3) then the triangle i...

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  9. In a Delta ABC,(a+b+c) (b+c+a)=kbc if

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  10. In Delta ABC if (a+b+c) ( a-b+c)= 3ac, Then find angle B

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  11. The perimeter of atriangle ABC is 6 times the arihmetic mean of the si...

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  12. If in A B C ,A C is double of A B , then the value of (cotA)/2cot(B-C...

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  13. In Delta ABC a =5 ,b=3 ,c=7 .Then value of 3coC +7 cos B is equal :-

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  14. In triangle ABC, of r(1)= 2r(2)=3r(3) Then a:b is equal :-

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  15. In any Delta ABC , cot(A/2),cot(B/2),cot(C/2) are in A.P., then

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  16. In Delta ABC of a :b:c= 7 : 8: 9 .Then cos A : cos B is equal to :-

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  17. The ratio of the area of a regular polygon of n sides inscribed in a c...

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  18. In Delta ABC anlge A = (pi)/(6) & b:c= 2: sqrt(3) "then " angle B is

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  19. In a triangle ABC a= 4 , b= 3 , angle A =60 ^@ ,Then c is root of equ...

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  20. In a right - angled isosceles triangle , the ratio of the circumradius...

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