1. triangles

2. GENERAL FEATURES
The triangle is a three-sided
polygon and therefore it has
three vertexes.
The sum of all the angles
of a triangle is equal to 180º.

3. TRIANGLE CLASSIFICATION

4. According to the meassure of
their sides, triangles can be:
• Equilateral triangle: they have
equal sides and angles.
• Isosceles triangle: they have at
least two equal angles.
• Scalene triangle: they have
three different sides.

5. According to the meassure of
their angles, triangles can be:
• Right triangle: they have a right
angle, that is to say, 90º angle.
Oppsite the right angle is the
hypotenuse and the other two
sides are the legs.
• Obtuse triangle: they have an
obtuse angle (+90º)
• Acute triangle: they have an
acute angle (-90º)