If we know the base length and height of a triangle, we can determine its area. The area of different triangles differs based on their size. The area of a triangle is the region that the triangle occupies in 2d space. Triangles classified based on both angles and sides are – To classify triangles according to both angles and sides, we measure the interior angles and length of the sides of the triangle. The types of triangles based on the length of the sides are – Obtuse Triangle or Obtuse-angled Triangle.Right Triangle or Right-angled Triangle.Acute Triangle or Acute-angled Triangle.Triangles can be classified by angles, as: To classify triangles according to their angles, we measure each of their interior angles. Triangles can be classified based on the length of the sides or their angle measurements. The area of a triangle is equal to half of the product of its base and height.
![definition of a altitude geometry definition of a altitude geometry](https://i.pinimg.com/originals/e4/18/eb/e418ebd2024db24b3a19d7253923322b.gif)
![definition of a altitude geometry definition of a altitude geometry](https://s3.studylib.net/store/data/007222681_1-d60a1a1ab8ffa8cce3086a2307ee3797.png)
The above figures are non-examples of triangles. Some real-life examples of triangles include sandwiches, traffic signs, cloth hangers, and a rack in billiards. The above figure is a triangle denoted as △ABC. A triangle is a closed, 2-dimensional shape with 3 sides, 3 angles, and 3 vertices.