Triangles are shapes that have three sides and three angles. There are different types of triangles, each with their own unique properties. Here are a few types of triangles:

Equilateral triangle: This is a triangle where all three sides are equal in length, and all three angles are equal (60 degrees each).

Isosceles triangle: This is a triangle where two sides are equal in length and the angles opposite those sides are equal.

Scalene triangle: This is a triangle where all three sides are different in length and all three angles are different.

Right triangle: This is a triangle where one angle measures exactly 90 degrees. The sides of a right triangle have special relationships, as described by the Pythagorean theorem.

Acute triangle: This is a triangle where all three angles are less than 90 degrees.

Obtuse triangle: This is a triangle where one angle is greater than 90 degrees.

Each type of triangle has its own unique properties and can be used in different ways in mathematics and real-life situations.