An obtuse-angled triangle is a triangle in which one of the interior angles measures more than 90° degrees. In an obtuse triangle, if one angle measures more than 90°, then the sum of the remaining two angles is less than 90°. Here, the triangle ABC is an obtuse triangle, as ∠A measures more than 90 degrees.

How do you know if a triangle is obtuse?

An acute triangle has three angles that each measure less than 90 degrees. An obtuse triangle is a triangle with one angle that is greater than 90 degrees.

Is obtuse-angled triangle isosceles?

An obtuse triangle may be isosceles or scalene. In an acute triangle, all angles are less than right angles? each one is less than 90 degrees. An acute triangle may be equilateral, isosceles, or scalene.