A. A.P
B. G.P
C. H.P
D. none
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 =
In ΔABC, if a= 26, b=30, cos C=63/65 then r1:r2:r3 =
In ΔABC, if a,b,c are in A.P. the greatest angle is A and least is C then 4(1- cos A) (1-cos C) =