A. 4:12:1
B. 3:4:12
C. 1:4:12
D. 4:12:3
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
A vertical tower stands on a declivity which is included at 150 to the horizon. From the foot of the tower a man ascends the declivity for 80 feet and then finds that the tower subtends an angle of 300. The height of the tower is
In ΔABC , if c2= a2+b2, 2s= a+b+c, then 4s (s-a) (s-b) (s-c) =