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The perimeter of a Delta ABC is 6 times ...

The perimeter of a `Delta ABC` is 6 times the A.M. of the sines of its angles. If the side 'a' is 1, then the angle A is

A

` 30 ^(@) `

B

` 45 ^(@) `

C

` 60 ^(@) `

D

` 90 ^(@) `

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A
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AAKASH SERIES-PROPERTIES OF TRIANGLES-EXERCISE - II
  1. In Delta ABC, " if " sin A , sin B are roots of c^(2) x^(2) - c( a...

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  2. In Delta ABC " if " 3 sin A = 6 sin B = 2 sqrt3 sin C , " then " a...

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  3. The perimeter of a Delta ABC is 6 times the A.M. of the sines of its a...

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  4. The radius of the circumcircle of an isosceles triangle PQR is equal t...

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  5. If b= 3, c= 4 angle B = (pi )/(3) then number of triangles that can b...

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  6. In a triangle ABC, C=90^@. Then (a^2-b^2)/(a^2+b^2)=

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  7. If A = 2 B then a^(2) =

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  8. In Delta ABC , (a)/( cos A) = (b) /( cos B ) = ( c ) /( cos C ) , If ...

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  9. The base of a triangle is 80 and one of the base angles is 60^@. IF th...

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  10. If the sides of trinangles are x^(2) + x+ 1,2 x + 1 , x^(-2) -1 wher...

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  11. The sides of a triangle are sin alpha,cos alpha and sqrt(1+sin alpha c...

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  12. In Delta ABC if b+c:c+a:a+b=11:12:13, then cos A: cos B: cos C=

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  13. The smallest angle of the triangle whose sides are 6+sqrt12,sqrt48,sqr...

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  14. In DeltaABC, " if" (1)/(a+c)+(1)/(b+c)=(3)/(a+b+c) then show that C=...

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  15. If DeltaABC, ifangleC=(pi)/(3), "then"(3)/(a+b+c)-(1)/(a+c) equals

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  16. If C=60^(@), " then show that"(a)/(b+c)+(b)/(c+a)=1

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  17. If angles A,B,C are in A.P . , then 2cos (( A-C)/( 2))=

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  18. If C = 60 ^(@) " then "= ( b)/( c^(2) -a^(2)) + ( a) /( c^(2)- b^(2...

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  19. In an acute angled Delta ABC , if a^(4) + b^(4) +c^(4) = 2c^(2)...

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  20. In Delta ABC, if (2 cos A)/a+ (cos B)/b+ (2 cos C)/c=a/(bc)+b/(ca), th...

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