Interior angles add up to 1260°.Ī 10-sided shape is called a Decagon. Interior angles add up to 1080°.Ī 9-sided shape is called a Nonagon. Interior angles add up to 900°.Īn 8-sided shape is called an Octagon. Interior angles add up to 720°.Ī 7-sided shape is called a Heptagon or Septagon. Interior angles add up to 540°.Ī 6-sided shape is called a Hexagon. The sum of the triangle’s three interior angles is 180°.Īn equilateral triangle is a regular triangle with 60° angles each.Īny triangle with one right angle is referred to as a right-angled triangle.Ī scalene triangle is an irregular triangle wherein every side and angle is unique.Īn isosceles triangle has two equal sides and two equal angles.Ī square is a regular quadrilateral with all vertices at 90° angles.Ī kite has two sets of equal-length sides, with diagonals intersecting at right angles.Ī rectangle is made up of two parallel straight lines, each with a 90° angle.Ī rhombus is defined by two parallel lines, equal sides, and opposite equal angles.Ī trapezium has one parallel pair of lines.Ī parallelogram is made up of two parallel lines and two opposite equal angles.Ī 5-sided shape is called a Pentagon. The entire arc has a 180° angle.Ī triangle is a closed polygon with three sides, three vertices, and three angles. The curved line’s points are at equal distances from its centre.Ī semi-circle has two sides, one curved and one straight. Let us look at a few of them and their properties.Ĭircles are entirely round shapes formed by a single curved line.

Regular and irregular 2D shapes include the circle, triangle, square, rectangle, pentagon, and hexagon.

A 2D shape is irregular if all of its sides are unequal in length and all of its angles are unequal in measurement.A 2D shape is considered to be regular if all of its sides have the same length and all of its interior angles are of the same measurement.Types of 2D ShapesĢD shapes are further classified into 2 types – regular or irregular – based on their length and interior angles. Rectangle, circle, square, triangle, quadrilateral and pentagon are some examples of 2D shapes. It has two dimensions: length and breadth, but no depth or height. A sheet of paper, for example, has a two-dimensional shape. Plane shapes are another term for 2D shapes: a two-dimensional, closed, or flat plane shape. For example, triangles and squares are polygons.īecause 2D objects have no depth, they cannot be physically held a 2D shape is absolutely flat. In general, plane figures made of lines are known as polygons. Also, these figures can have any number of sides. Straight or curved lines make up the sides of this shape.

In other words, a plane object that has only length and breadth is 2 dimensional. I think they will probably remove np.matrix in future versions because it doesn't add anything really useful other than bugging the mind of developers.In geometry, a shape or a figure that has a length and a breadth is a 2D shape. It has certain special operators, such as * (matrix multiplication) and ** (matrix power).Īlso, notice this example so you can see the difference: a = np.matrix(,])īecause matrix 'a' squared is that, but if you do the same thing with array: a = np.array(,])īecause it applied the square in all elements if you want the behaviour of np.matrix you would have to use np.dot Returns a matrix from an array-like object, or from a string of data.Ī matrix is a specialized 2-D array that retains its 2-D nature through operations. It is no longer recommended to use this class, even for linear algebra. From NumPy documentation of np.matrix: Note: I think you are confusing things here, np.array can have any number of dimensions and np.matrix only two, np.matrix is the specific case where ndim=2 and have special matrix operators.

2 dimensional vs 3 dimensional shapes