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In a triangle ABC, if b+c=2aandangleA=60...

In a triangle ABC, if `b+c=2aandangleA=60^(@),"then "DeltaABC` is

A

Scalene

B

Equilateral

C

Isosceles

D

Right angled

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The correct Answer is:
B
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TARGET PUBLICATION-TRIGONOMETRIC FUNCTIONS -Competitive Thinking
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  2. If a, b, c are the sides of the triangle ABC such that a^(4) +b^(4) +c...

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  3. In a triangle ABC, if b+c=2aandangleA=60^(@),"then "DeltaABC is

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  4. If in a DeltaABC, sin A: sin C = sin (A - B): sin (B-C), then a^(2),...

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  5. In a triangle ABC If ( 2 cos A)/a + ( cos B)/b + (2 cos C)/c = a/(bc)...

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  6. If 4sinA=4sinB=3sinC" in a "DeltaABC, then cos C =

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  7. Let D be the middle point of the side BC of a triangle ABC. If the tri...

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  8. The angles of a triangle ABC are in an arithmetic progression. The lar...

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  9. In DeltaABC,ifcotA,cotB,cotC be in A.P. then a^(2),b^(2),c^(2) are in

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  10. If in DeltaABC,2b^(2)=a^(2)+c^(2),"then "(sin3B)/(sinB)=

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  11. In a triangle ABC, if b^2 + c^2 = 3a^2, then cotB + cotC-cotA is equal...

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  12. If the sides of the triangle ABC are p,q and sqrt(p^(2)+ pq+q^(2)), th...

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  13. If the line segment joining the points A(a,b) and B(c,d) subtends an a...

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  14. Let ABC be a triangle such that angleACB=pi/6 and let a , b and c deno...

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  15. If two adjacent sides of a cyclic quadrilateral aré 2 and 5 and the an...

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  16. In triangle ABC, if A = 2B, and the sides opposite to the angles A, B,...

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  17. In triangleABC, (b+c)cosA+(c+a)cosB+(a+b)cosC=

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  18. In DeltaABC,cosecA(sinBcosC+cosBsinC)=

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  19. IN triangleABC, (cosC+cosA)/(c+a)+(cosB)/(b)=

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  20. In DeltaABC, with usual notations, if a,b,c are in AP then acos^(2)((C...

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