A three-sided shape is called a triangle. Triangles are one of the most basic and fundamental shapes in geometry. They are formed by connecting three straight lines, and the points where these lines meet are called vertices. The sum of the interior angles of a triangle always adds up to 180 degrees.
Triangles can be classified based on their sides and angles:
- Equilateral Triangle: All three sides are equal in length, and all three angles are 60 degrees.
- Isosceles Triangle: Two sides are equal in length, and the angles opposite these sides are also equal.
- Scalene Triangle: All sides and angles are of different lengths and measures.
- Right Triangle: One of the angles is exactly 90 degrees.
- Acute Triangle: All three angles are less than 90 degrees.
- Obtuse Triangle: One of the angles is greater than 90 degrees.
Triangles are used in various fields such as architecture, engineering, and art due to their structural stability and simplicity.