Is the triangle, whose vertices are `(5, -6), (1, 2) and (-7, -2)`, a right-angled triangle, an acute-angled triangle or an obtuse-angled triangle?

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

In a right-angled triangle, the two acute angles are in the ratio 4:5 . Find these angles .

A tirangle hs vertices (1,2,4 ), (-2,2,1) and (2,4,-3) . Prove that the triangle is right angled triangle

Find the ara of the given obtuse-angled triangle ABC.

A triangle whose one angle is more than 90^0 is called (a) a scalene triangle (b) a right triangle (c) an acute triangle (d) an obtuse triangle

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

Write the sum of the angles of an obtuse triangle.

Find the angles of a triangle whose vertices are A(0,-1,-2),B(3,1,4) and C (5,7,1).

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 a vertex, the circumcenter, and the centroid of a triangle are (0, 0), (3,4), and (6, 8), respectively, then the triangle must be (a) a right-angled triangle (b) an equilateral triangle (c) an isosceles triangle (d) a right-angled isosceles triangle