Types of triangles based on internal angle.

Types of triangles:

(Based on the internal angles)

  Based on the internal angles the triangles are of 3 types.
        1-Acute triangle
        1-Right triangle
        2-Obtuse triangle

1-Acute triangle:

         An acute triangle is a triangle with three acute angles. 

Acute triangle.

2-Right triangle:

          A right triangle or right-angled triangle is a triangle in which one angle is a right angle. The relation between the sides and angles of a right triangle is the basis for trigonometry. The side opposite the right angle is called the hypotenuse. The sides adjacent to the right angle are called legs.
           

         Right triangle

3- Obtuse triangle:

     An obtuse triangle is a triangle with one obtuse angle and two acute angles. Since a triangle's angles must sum to 180° in Euclidean geometry, no Euclidean triangle can have more than one obtuse angle.

Obtuse triangle