For a`/_\ABC, if cotA.cotB.cotCgt0`, then nature of the triangle is
(A) acute angled triangle
(B) right angled triangle
(C) obtuse angled triangle
(D) none of these

Classify these triangles as right, acute or obtuse angled triangle.

The minimum value of tan B tan C in an acute angled triangle ABC is

A right triangle cannot have an obtuse angle.

In a triangle ABC,right angled at B, then

If triangle ABC , is obtuse angled at C , then

If in a /_\ABC, sin^2A+sin^2B+sin^2C=2, then /_\ is always a an (A) isosceles triangle (B) right angled triangle (C) acute angled triangle (D) obtuse angled triangle

If normal at point P on the parabola y^(2)=4ax,(a>0), meets it again at Q in such a way that OQ is of minimum length, where O is the vertex of parabola,then OPQ is (a)a right angled triangle (b)an obtuse angled triangle (c)an acute angle triangle (d)none of these

if in triangle ABC right angled at C then tan A+tan B