In ΔABC, if b=c=R then A=

In ΔABC, if r₁,r₂,r₃ are in H.P, then a, b, c are in

I: In a ΔABC, if 4s(s-a) (s-b) (s-c) =a²b² then it is right angled triangle

II: In a ΔABC, if sin A+ sin B +sin C maximum then triangle is equilateral

In ΔABC, if cos A cos B +sin A sin B sin C =1, then a:b:c =

If 4,5 are two sides of a triangle and the included angle is 60⁰, then is area is

In ΔABC, if r₁ =3, r₂= 10, r₃= 15, then c=

.In ΔABC, if 2R+ r= r₁, then the triangle isa

If sin(y+z-x),sin(z+x-y), sin(x+y-z) are in A.P then tan x, tan y, tan z are in

If Two angles of a triangle are 30⁰, 45⁰ and the included side is √3+1, then the remaining sides are

In ΔABC, if (a+b-c) (a+b-c) = 3ab, then C =