# Types of triangles (Tipos de triángulos en inglés)

## A triangle is a three sided polygon, What are the different types of triangles? ### EQUILATERAL TRIANGLE

A triangle with three congruent (equal) sides and three equal angles.

All the sides length (shown by the line through each of them) and all the angles a the same length:

∠ A = ∠ B = ∠ C = 60º ### ISOSCELES TRIANGLE

A triangle with at least two congruent (equal) sides.

Two sides are equal (shown by the lines). Angles opposite the equal sides are equal:

∠ B = ∠ C ### RIGHT TRIANGLE

Has only one right angle (90 degrees).

This is shown by the square block at angle B. The side opposite the right angle in called the hypotenuse:

∠ B = 90º ### SCALENE TRIANGLE

A triangle that has no congruent (equal) sides.

No sides are equal, no angles are equal

A ≠ B ≠ C ### ACUTE-ANGLED

All the angles are less than 90º.

∠ A < 90º, ∠ B < 90º, ∠ C < 90º ### OBTUSE-ANGLED

One of the angles is greater than 90º. The longest side is opposite the larget angle.

∠ A >90º 