If in a triangle ABC,` tanA+tanB+tanC>0` the triangle is (A) acute angled triangle (B) obtuse angled (C) right angled (D) none of these

In an acute-angled triangle ABC, tanA+tanB+tanC

The points (0,8/3),(1,3) and (82 ,30) are the vertices of (A) an obtuse-angled triangle (B) an acute-angled triangle (C) a right-angled triangle (D) none of these

In a triangle A B C\ a : b : c=sqrt(3)\ :1\ :\ 1, then the triangle is- right angled triangle (b) abtuse angled triangle acute angled triangle, which is not isosceles Equilateral triangle

In a triangle ABC, 8R^2=a^2+b^2+c^2 prove that the triangle is right angled

If angle C of a triangle ABC be obtuse, then (A) 0 1 (C) tan A tan B=1 (D) none of these

Angle formed in minor segment of a circle is (a) acute (b) obtuse (c) right angle (d) none of these

The position vectors of the vertices A ,Ba n dC of a triangle are three unit vectors vec a , vec b ,a n d vec c , respectively. A vector vec d is such that vecd dot vec a= vecd dot vec b= vec d dot vec ca n d vec d=lambda( vec b+ vec c)dot Then triangle A B C is a. acute angled b. obtuse angled c. right angled d. none of these

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

If the sines of the angles A and B of a triangle ABC satisfy the equation c^2x^2-c(a+b)x+a b=0 , then the triangle (a) is acute angled (b) is right angled (c) is obtuse angled (d) satisfies the equation sinA+cosA ((a+b))/c

If one angle of a triangle is equal to the sum of the other two angles, then the triangle is (a) an isosceles triangle (b) an obtuse triangle (c) an equilateral triangle (d) a right triangle