A triangle is a simple geometric shape that has three sides and three angles. It is one of the basic shapes in geometry and can be found in many everyday objects, like the pyramid or the road sign. The sum of the angles in a triangle always equals 180 degrees, which is a fundamental property that helps in various calculations. There are different types of triangles based on their sides and angles. For example, an equilateral triangle has all three sides equal, while a right triangle has one angle that measures 90 degrees. Understanding triangles is essential in fields like architecture and engineering, where they are used for stability and design.