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In a triangle ABC, if a =2x, b=2y and C=...

In a triangle ABC, `if a =2x, b=2y and C=120^(@),` then the area of the triangle is-

A

2xy

B

xy

C

`sqrt3xy`

D

4xy

Text Solution

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The correct Answer is:
C
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CHHAYA PUBLICATION-MCQ's-QUESTION PAPER 5
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  2. In a triangle ABC, if a =2x, b=2y and C=120^(@), then the area of the ...

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  3. if tan (A-B) =1 and sec (A +B) =(2)/(sqrt3), then the smallest positiv...

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  4. The minimum value of (sin x+ cos x) is-

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  5. If cot theta = x (gt0), then the value of sin theta is-

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  6. If in a triangle ABC, a cos ^(2)""C/2+ c cos ^(2)""A/2=(3b)/(2), then ...

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  7. The numbers tan (-(11pi)/(6)), tan((21pi)/(4))and cot ((283pi)/(6)) a...

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  8. If cos A""1/7 and cos B= 13/14, where A and B both are acute angles, ...

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  9. Let alpha, beta be such that pi lt alpha lt beta lt 3pi, if sin alpha...

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  10. If 12 cot ^(2) theta -31 cosec theta + 32=0, then the value of sin the...

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  11. If theta and phi are positive acute angles satisfying sin theta =1/2 a...

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  12. The maximum value of (4 sin ^(2)x + 3 cos ^(2) x) is-

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  13. If alpha, beta , gamma are angles of a triangle then the value of (sin...

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  14. Let n be a natural number such that n gt 4 and U(n) =sin ^(n) x+ cos ^...

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  15. If x=sin ^(2) theta + cosec ^(2) theta, then which one of the followin...

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  16. The value of sin 47^(@) -sin 25^(@)+sin 61^(@)-sin 11^(@) is-

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  17. If 0 lt theta lt pi/2 and sin 2 theta = cos 3 theta, then the value ...

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  18. If in a DeltaABC, the altituds drawn from the vertices A,B, C on oppos...

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  19. If cos A =3/4 then, the value of sin ""A/2sin ""(5A)/(2) is-

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  20. If tan ""(alpha pi)/(4) =cot ""(beta pi)/(4), then which one of the fo...

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