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If in DeltaABC, a=2b and A=3B, then A is...

If in `DeltaABC`, a=2b and A=3B, then A is equal to

A

`90^(@)`

B

`60^(@)`

C

`30^(@)`

D

`45^(@)`

Text Solution

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The correct Answer is:
A
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OBJECTIVE RD SHARMA-PROPERTIES OF TRIANGLES AND CIRCLES CONNECTED WITH THEM-Chapter Test
  1. In DeltaABC if a=(b-c)sectheta then (2sqrt(bc))/(b-c)sin(A/2)=

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  2. In a DeltaABC, (a + b + c) (b + c - a) = lambda bc. (where symbols ha...

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  3. If in DeltaABC, a=2b and A=3B, then A is equal to

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  4. Let the angles A , B and C of triangle A B C be in AdotPdot and let b ...

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  5. If in a Delta ABC, AD, BE and CF are the altitudes and R is the circum...

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  6. If in a triangleABC=(a)/(cos A)=(b)/(cos B), then

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  7. In a triangleABC, s/R=

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  8. If in a triangleABC, A=pi/3 and AD is the median, then

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  9. If any triangleABC, the value of a(b^(2)+c^(2))cos A+b(c^(2)+a^(2))cos...

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  10. If the angle of a right angled triangle are in A.P. then the ratio of ...

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  11. The sum of the radii of inscribed and circumscribed circle of an n sid...

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  12. If 0 lt x lt pi/2 then the largest angle of a triangle whose sides are...

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  13. The sides of a tringle are 3x+4y, 3y and 5x+5y where x,y gt0, then the...

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  14. The perimeter of a triangle is 16 cm. One of the sides is of length 6 ...

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  15. In a triangleABC," if "(a)/(b^(2)-c^(2))+(c)/(b^(2)-a^(2))=0," then "a...

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  16. In a triangleABC, a^(2) sin 2C+c^(2) sin 2A=

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  17. In a triangleABC, (cos C+cos A)/(c+a)+(cos B)/(b)=

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  18. In in a triangle ABC, sides a,b,c are in A.P. then tan""A/2 tan""C/2

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  19. In a triangle ABC, cos A+cos B+cos C=

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  20. If A+B+C =pi, and cos A = cos B. cos C, then cot B. cot C =

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