All of the internal angles formed by the vertices are equal to 90º. On the other hand, an example of a triangle classified by its internal angles is a right triangle, which has an angle of 90º.ĭifferent triangles, StudySmarter Originals SquareĪs 2-dimensional figures, squares are formed by four equal sides with four vertices. If none of the sides are the same length, the triangle is called a scalene triangle. We can also distinguish types of triangles by the angles they form with one another.įor example, the triangles with all sides of the same length are called equilateral triangles, while if they have just two equal sides, they are called isosceles triangles. We can distinguish between different types of triangles depending on whether the sides are equal or not. The summation of all the internal angles in a triangle is equal to 180º. TriangleĪs a 2D shape, the triangle consists of three sides and three vertices. Let's consider each of these four two-dimensional shapes in more detail. In Tetris, there are numerous two-dimensional shapes, but in math, there are four distinguished two-dimensional figures we work often with: All of the shapes we can see in this game are two-dimensional figures that have lengths and widths. Now, think about the popular game, Tetris, which is played in 2D. We will mainly focus on closed shapes, as they are the most common in math.Įxamples of 2-dimensional figures, StudySmarter Originals Examples of 2-dimensional figures All sides do not have to be connected, as we can distinguish between closed shapes or open shapes, depending on whether they form vertices or not. These lines that form the shapes are called the sides of the plane figure. In math, there are as many 2D shapes as you can imagine, as you just have to link one line with another in a plane. We just need one plane to show these 2D figures, as they do not have depth. Two-dimensional figures are the flat plane shapes or figures that have two dimensions (length and width) in the same plane.įor example, if we drew three lines on a 2D plane surface, like a piece of paper, we could obtain a triangle, which is an example of a 2D shape.
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