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A triangle is a closed figure bounded by three surfaces.
The sum of internal angles in a triangle is 180.
The sum of exterior angles of triangle is equal to 360.

There are three types of triangles based on sides.
1)Equilateral triangle
2)Isosceles triangle
3)Scalene triangle

There are three types of triangles based on angles.
1)Right angle triangle
2)Acute angle triangle
3)Obtuse angle triangle

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A triangle is polygon with 3 sides. It is the polygon with the least number of sides.

Based on the length of sides and angles, there are 3 types, Equilateral (all sides equal, all angles are 60), Isosceles (two sides equal, two angles equal) and Scalene (no equal side or angles)

Based on it's angles, there are 3 types, Acute-Angled (all angles are lesser than 90), Right-Angled (has a right angle) and Obtuse-Angled (has an angle greater than 90).

=All angles add to 180.
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