A. 2,√2
B. 2,2√3
C. √2,4
D. 2,4√3
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) =
If a, b, c are the sides of a triangle then the range of ab+bc+ca/a2+b2+c2 is
If (a+b)2 = c2+ab in a ΔABC and if √2 (sin A+ cos A) =√3 then ascending order of angles A,B,C is
In ΔABC, (r1 +r2) (r2 +r3) (r3+r1) =
In ΔABC , if a=7, b=7√3 and right angled at C, then c=
If α, β are solutions of a tan θ+b sec θ=c then tan (α+β) =
If I1,I2,I3 are excentres of the triangle with vertices (0,0), (5,12), (16,12) then the orthocentre of ?I1,I2,I3 is
An observer finds that the angular elevation of a tower is θ. On advancing ‘a’ metres towards the tower, the elevation is 450 and on advancing b metres the elevation is 900-θ. The height of the tower is