Geometric Shapes

Geometric shapes are the figures which demonstrate the shape of the objects we see in our everyday life. In geometry, shapes are the forms of objects which has boundary lines, angles and surface. There are different types of 2d shapes and 3d shapes.  

In plane geometry, the two-dimensional shapes are flat shapes and closed figures such as circle, square, rectangle, rhombus, etc.  In solid geometry, the three-dimensional shapes are cube, cuboid, cone, sphere and cylinder. We can observe all these shapes in our daily existence also. For example books (cuboid shape), glasses (cylindrical shape), traffic cones (conical shape) and so on. In this article, you will learn different geometric shapes and their definition along with the examples.

Table of Contents:

To be Noted:

  • A point has no dimension and a line is a one-dimensional shape. Both of these are the base of geometry. When two lines meet at a point, they form an angle where the point is said to be vertex and lines are the arms. 
  • The two-dimensional and three-dimensional shapes are formed using point, lines and angles. 

Shapes are nothing but simple geometric figures which have a specific boundary, interior and exterior surface area. In geometry, we can learn various shapes and their properties. Students are introduced with geometry in their classes with basic shapes and terms.

Geometric Shapes Definition

Geometrical shapes are the figures which represent the forms of different objects. Some figures are two-dimensional, whereas some are three-dimensional shapes. The two-dimensional figures lie on only x-axis and y-axis, but 3d shapes lie in x,y and z axes. The z-axis shows the height of the object. As we have already discussed in the introduction, there are different shapes defined in geometry.

To draw any of these figures start with a line or a line segment or a curve. Depending upon the number and arrangement of these lines, we get different types of shapes and figures like a triangle, a figure where three line segments are connected, Pentagon (five-line segments) and so on. But every figure is not a complete figure.

List of Geometric Shapes

Here is the list of different geometric shapes that we learn in geometry.

Two Dimensional Shapes Three Dimensional Shapes
  • Triangle
  • Circle
  • Semi-Circle
  • Square
  • Rectangle
  • Parallelogram
  • Rhombus
  • Trapezium
  • Kite
  • Polygons (Pentagon, Hexagon, Octagon, Nonagon, Decagon, etc.)
  • Sphere
  • Cube
  • Cuboid
  • Cone
  • Cylinder

Types of Shapes

Go through the different types of shapes in geometry along with definitions here.

Triangle

Triangle is a polygon, which is made of three sides and consists of three edges and three vertices. Also, the sum of its internal angles equals to 180o.

Circle

Locus of all points at a fixed distance from a reference central point is called a Circle.

Square

Square is a quadrilateral where all the four sides and angles are equal and the angles at all the vertices equal to 90° each.

Rectangle

A quadrilateral which has its two pairs of opposite sides equal in length and interior angles are at the right angles.

Parallelogram

A parallelogram is a quadrilateral with two pairs of parallel sides and opposite angles are equal in measures.

Polygons

These are made up of line segments and no curves. They are enclosed structure based on different length of sides and different angles.

Table of 2d Shapes

Circle Circle
Semicircle Semi circle
Oval Oval
Triangle Triangle
Square Square
Rectangle Rectangle
Parallelogram Parallelogram
Rhombus Rhombus
Trapezium Trapezium
Kite Kite
Pentagon Pentagon
Hexagon Hexagon
Heptagon Heptagon
Octagon Octagon
Nonagon Nonagon
Decagon Decagon

Three-Dimensional Shapes

Most of the three-dimensional shapes can be defined as a set of vertices, lines that connect the vertices and faces enclosed by these lines including obtained interior points. For many three dimensional shapes, faces are two-dimensional. Also, some shapes in three-dimensions have curves surfaces. In three dimensions, the primary shapes are:

  • Cube
  • Cuboid
  • Cone
  • Cylinder
  • Sphere

These can be better understood with the help of the table given below:

Name of the shape Figure Definition
Cube A cube is a three-dimensional shape which has 6 faces, 8 vertices and 12 edges. The faces of the cube are square.

Example: A Rubik’s cube

Cuboid Shapes in Maths - Cuboid A cuboid is also three dimensional solid having 6 faces, 8 vertices and 12 edges but the faces of the cuboid are in a rectangular shape. 

Example: Matchbox

Cone Shapes in Maths - Cone A cone is a solid which has a circular base and narrows smoothly from surface to the top at a point called apex or vertex. 

Example: An icecream cone

Cylinder Shapes in Maths - Cylinder A cylinder is a 3d solid shape that has two parallel circular bases connected by a curved surface. It has no vertex. 

Example: Gas cylinder

Sphere Sphere A sphere is a round shape in 3d plane, whose radius is extended to three-dimensions (x-axis, y-axis and z-axis).

Example: Ball

Open and Closed Figures

A point is a small dot which is the starting point of a line segment. By definition, a line segment is a part of a line in which a narrow lane is connecting two points within a line. Different numbers of line segments give us different figures and such figures may be either open figure or closed shapes or figures.

Geometric shapes

Closed Shapes

Geometric shapes such as a square, rectangle, and triangles are few basic 2D shapes. These figures are collectively called polygons. A polygon is any flat shape or plane on a surface of a paper. They have a finite closed boundary made up of a fixed number of line segments and are called sides of the polygon. Each side meets at a common point called corners (vertex).

Such bounded geometric shapes like polygons are called closed figures. A boundary of a closed figure is not only made of line segments but also by curves. Hence, a closed figure can be defined as any geometric shape which starts and ends at the same point to form a boundary by line segments or by curves.

Closed Geometric shapes

Open Shapes

Open figures are incomplete shapes. To sketch a closed figure one has to meet both the starting point and ending point. Open figures are also depicted by using line segments or by curves but at least of the lines will be discontinuous. An open figure’s starting and endpoints are different.

Open Geometric shapes

Solved Examples

Q.1: Find the open figure from the following.

Geometric shapes Question
Solution: Correct answer is figure D. All other figures are closed figures where both the start and endpoints are the same.

Q.2: How many sides do a decagon has?

  1. 8
  2. 9
  3. 10
  4. 11

Answer: The correct answer is C. 

A decagon has 10 sides and 10 vertices.

Q.3. A cone is a two-dimensional shape or three-dimensional shape?

Answer: A cone is a three-dimensional solid shape with a circular base and a single vertex. The surface of the cone is narrowed from the base to the vertex.

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Frequently Asked Questions – FAQs

What are the different geometric shapes in Maths?

There are many shapes in geometry based on their dimensions.
Circle, Triangle, Square, Rectangle, Kite, Trapezium, Parallelogram, Rhombus and different types of polygons are the 2-d shapes.
Cube, Cuboid, Sphere, Cone and Cylinder are the basic three-dimensional shapes.

What are the types of triangles in geometry?

There are basically six types of triangles:
Scalene Triangle
Isosceles Triangle
Equilateral Triangle
Acute-angled triangle
Obtuse-angled triangle
Right-angled triangle

What are the basic kinds of polygons?

The basic polygons are:
Triangle
Quadrilaterals – square, rectangle, parallelogram, trapezium, kite
Pentagon
Hexagon
Heptagon
Octagon
Nonagon
Decagon

What are the examples of three-dimensional shapes?

Cube – Sugar cube, Rubik’s cube
Cuboid- A wooden rectangular box, matchbox
Cone- Icecream cone, Pyramid
Sphere- Football, Basketball
Cylinder- Gas cylinder, Cylindrical jar

What are the basic solid shapes?

The basic solid shapes are Cube, Cuboid, Cone, Sphere, Hemisphere and Cylinder.

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