👉 Triangles are a basic geometric shape consisting of three sides and three vertices. These shapes play an important role in many areas of mathematics, science, engineering, architecture, and art. In geometry, a triangle is any shape that has three sides and three angles (which can be acute or obtuse). The sum of the measures of the interior angles of a triangle always equals 180 degrees. The first angle is opposite the side adjacent to the vertex at which it is formed; the second