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If the angles of a triangle are in A.P....

If the angles of a triangle are in A.P., a=2 c= 4 , then b=

A

` 2sqrt3`

B

` sqrt(21) `

C

` 8`

D

`14`

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The correct Answer is:
A
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AAKASH SERIES-PROPERTIES OF TRIANGLES-PRACTICE EXERCISE
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  2. If in a triangle ABC, the altitudes from the A,B,C on opposite sides a...

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  3. If the angles of a triangle are in A.P., a=2 c= 4 , then b=

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  4. In Delta ABC on root of the equation x^(2) - 2bx cos A + b^(2) ...

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  5. In a triangle ABC, (a^2-b^2-c^2) tan A+ (a^2-b^2+c^2) tan B is equal t...

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  6. If the angles of a right angled triangles are in A.P. Then the side...

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  7. If sides of a triangles are in the ratio x: y : sqrt( x^(2) +xy + y...

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  8. If a:b: c = 3: 5: 7 then cos A : cos B : cos C

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  9. If A = 60 ^(@) " then " ( 1)/(a+b) + (1) /( a+ c) =

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  10. In Delta ABC if a =2, b= 3, c = 4 then cos A + cos B + cos C =

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  11. In Delta ABC , 2ac sin ""( 1)/(2) (A-B+C)=

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  12. The sides of a triangles are x^(2) +3x + 3, 2x+ 3 and x^(2) + 2x th...

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  13. In Delta ABC , if c^(4) - 2 (a^(2) + b^(2) ) c^(2) + a^(4) +a^(2)...

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  14. In triangle ABC , a = 4, b = 3 and angle A = 60^(@) . Then c is root...

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  15. The roots of x^(2) - 2 sqrt 3 x+ 2=0 represent two sides of a tria...

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  16. (c- b cos A )/( b - c cos A ) =

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  17. ( b+c) cos A + ( c+a) cos B +( a+b) cos C =

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  18. In Delta ABC , if a( b cos C + c cos B ) = 2ka^(2) , then k=

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  19. In Delta ABC , if A,B , C are in A.P. The (a+c)/( sqrt(a^(2) -ac + ...

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  20. InDelta ABC , a( b cos C - c cos B) =

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