FrancophonIA/Vikidia-EnFr huggingface dataset:
A triangle is a shape, or a  part of two dimensional space. It has three straight sides and three vertices. The three angles of a triangle always add up to 180° (180 degrees). It is the polygon with the least possible number of sides.

Triangles can be grouped according to how long their sides are:

Triangles can also be grouped by their angles:

Equilateral triangle

Isosceles triangle

Scalene triangle

Right triangle

Obtuse triangle

Acute triangle

Triangles are extremely useful. Measuring objects using triangles is called trigonometry. Some people have spent their entire lives studying triangles for use in trigonometry.

Modern computers usually use triangles to make more complex graphic images or shapes.