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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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ML KHANNA-PROPERTIES OF TRIANGLES -Problem Set (2)(MULTIPLE CHOICE QUESTIONS)
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  12. In Delta ABC, (a + b+ c) (b + c -a) = kbc if

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  13. In a triangle ABC, 2ac sin((A-B+C)/2) =

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  14. In a A B C , prove that: (b^2-c^2)cotA+(c^2-a^2)cot B+(a^2-b^2)cotC=0

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  16. The sides of a triangle ABC are 6 , 7 , 8 and the smallest angle being...

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  18. The sides of a triangle ABC are 6, 7, 8, the smallest angle being C th...

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  19. In a triangle cot A:cot B:cot C = 30:19:16 " then " a:b:c

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  20. The sids of a triangle aresqrt((b^2+c^2)),sqrt((c^2+a^2)),sqrt((a^2+b^...

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