Obtuse triangle a triangle whose one angle is obtuse is called an obtuse-angled triangle or an obtuse triangle.

An obtuse angle is

An obtuse angle is

Write the sum of the angles of an obtuse triangle.

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

A right triangle cannot have an obtuse angle.

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

Which of the following statements are true (T) and which are false (F): Sum of the three angles of a triangle is 180^0 A triangle can have two right angles. All the angles of a triangle can be less than 60^0 All the angles of a triangle can be greater than 60^0 All the angles of a triangle can be equal to 60^0 A triangle can have two obtuse angles. A triangle can have at most one obtuse angles. In one angle of a triangle is obtuse, then it cannot be a right angled triangle. An exterior angle of a triangle is less than either of its interior opposite angles. An exterior angle of a triangle is equal to the sum of the two interior opposite angles. An exterior angle of a triangle is greater than the opposite interior angles

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

Can a triangle have two obtuse angles? Why?