What is a Plane in Geometry?


Plane surfaces in geometry refer to the two-dimensional (2D) shapes drawn on a flat surface. There is a thin difference between using the plane in mathematics and geometry; as a plane in geometry, it refers to the 2D plane till infinity. Also, there are two types of planes that include parallel planes and intersecting planes, which creates different functionality in various areas of geometry. Plane surface in geometry arises from Euclidean theory that specifies the plane in its core and axis. It specifies that a geometry plane is a ruled surface. There are many examples of a plane, including various shapes drawn on paper and surfaces of three-dimensional (3D) objects.

Have you ever compared a real tree and a tree drawn on paper? The difference you will notice is the generalisation of the drawing on a surface in two dimensions, and the actual tree which we see is in three dimensions. There are many more examples of a plane, to be precise, depending upon their uses in real life. This phenomenon can be understood with the help of geometry.

The branch of mathematics studying dimensions, shapes, positions of angles, and the sizes of different things is called geometry. It is a fascinating concept that helps us understand dimensionality and the differences between 2D and 3D objects. An individual studying geometry is known as a Geometer. Geometry is divided into basic and advanced levels.

At Cuemath, we are a one-stop solution website for all queries and questions about Basic and Advanced Geometry. We provide you with all the answers in a simple and hassle-free way. We are here to provide you with all the information and guidance required for examples of planes in geometry. So let’s move on and have a look at some examples of planes in geometry.

What is the Plane?

Imagine you lived and travelled in a two-dimensional world with friends, but nothing in the world has a height in reality, where distances and angles cannot be measured as well. Travelling can be done faster or slower where we could go forward, backward, or sideways.

What is Life Like Living on a Plane Surface?

A plane in geometry refers to a flat 2D surface without thickness. It is difficult to imagine an object with only two sides as there is nothing two dimensional in reality. Planes do not even have an edge with them, whereas an object with three sides, which we generally observe, is 3D.

Planes and Mathematics

A flat surface that is huge with zero thickness is a plane. It is hard to draw planes since the edges must be drawn. At the point when you see an image that speaks to a plane, consistently recall that it has no edges, and it is enormous. The plane has two measurements: length and width. Since the plane is enormous, the length and width can’t be estimated.

From a mathematical perspective, there are four kinds of measurements:


  • Point – It is also known as a Zero measurement, which alludes to a point or a speck with no sides, no edges, and zero thickness.
  • Line – It is a measurement that alludes to a straight line that has two endpoints, no edges, and zero thickness.
  • Plane – Other than this, we have a 2D drawing that alludes to a plane drawn on a surface.
  • 3D object – An object having more than two sides defining its length, breadth, and height and has volume is referred to as a 3D object.


Similarly, as a line is characterised by two points, a plane is characterised by more than two points. Generally, it focuses on planes that are not collinear, whereas there is only one plane that contains every one of the three.

In another part of arithmetic called geometry, points are situated on the plane utilising their directions – two numbers that show where the fact is situated. To accomplish this, the plane is thought to have two scales at the right angles. Utilising a couple of numbers, any point on the plane can be exceptionally depicted.

Euclidean Geometry

The Greek mathematicians of Euclid’s time considered calculation as a theoretical model of the world wherein they lived. The thoughts of point, line, plane, or surface were gotten based on what was seen around them. From investigations of the space and solids in the space around them, a theoretical mathematical thought of a strong item was created. A strong item has shape, size, position, and can be moved to start with one spot then onto the next. Its limits are called surfaces. They separate one piece of the space from another and are said to have no thickness. The limits of the surfaces are bent or straight lines. These lines end in segments.

Types of Planes

Two unmistakable planes are either parallel or meet in a line, i.e., they are intersecting at a certain point. A line is either parallel to a plane, meets it at a solitary point, or is contained in the plane. Two particular lines opposite to a similar plane must be parallel to one another. Two particular planes opposite to a similar line must be parallel to one another.

Parallel plane

Parallel planes will be planes in a similar 3D space that never meet. The parallel is a term in geometry and regular daily existence that alludes to a property of lines or planes. Parallel lines or planes are close to one another; however, never contact one another. This implies they never converge anytime. Regardless of whether these two line fragments were reached out to endlessness, there could never be a state of convergence among them. Thus two parallel lines in a 2D plane cannot intersect each other and are consistently separated by a fixed gap.

Intersecting plane

The intersecting plane refers to a cutting of the parallel plane. The parallel lines seem to meet simply off the surface. This is only a rare case of perception. On a genuine extended plane, the lines will draw nearer to one another and meet in infinity. The two planes share a cross-over line that meets them at 90°. Regardless of whether these two line segments reach out to boundlessness, there could never be a state of crossing point among them. Thus intersecting planes in a 2D plane usually cut each other at right angles that make an angle of 90°.

To be clarified all the more completely, envision a book with pages. At the point when the book is closed, the pages are as a parallel plane. On the other hand, imagine that the book is closed, then the pages go about as parallel planes. Although when we open the book, the pages stay opposite to one another at the right angle, consequently making a genuine case of intersecting planes.

Planes in Various Areas of Geometry

Plane geometry and quite a bit of strong math were first spread out by the Greeks somewhere in the range of 2000 years back. Euclid specifically made incredible commitments to the field with his book “Components” which was the primary profound, precise composition regarding the matter. Specifically, he constructed a layer-by-layer succession of sensible advances, demonstrating certain that each progression followed consistently from those previously.

The study of calculations and geometry can be broken into two wide varieties: plane math, which manages just two measurements, and strong math, which permits each of the three. Our general surroundings are three-dimensional, having a width, profundity, and height. Solid calculation manages protests in that space, for example, 3D shapes and circles. Plane math bargains in objects that are level, for example, triangles and lines that can be drawn on a level bit of paper.

Planes and their Shapes

There are different kinds of planes utilised in calculation. In math, we utilise the plane as the areas of plane figures: square, square shape, rhombus, parallelogram, trapezoid, quadrangle, right-calculated triangle, isosceles triangle, the symmetrical triangle, self-assertive triangle, polygon, customary hexagon, circle, area, a section of a circle and some more. A plane is a 2D cut of room.


A polygon is a two-dimensional closed shape that includes a finite number of straight sides and doesn’t need equal sides or equal angles.

  • Triangle – It has three sides with equivalent or inconsistent sizes.
  • Square – It has four equal sides, with every two sides intersecting and making a right angle.
  • Pentagon – It has 5 Sides.
  • Hexagon – It has 6 Sides.
  • Heptagon – It has 7 Sides.
  • Octagon – It has 8 Sides.
  • Nonagon – It has 9 Sides.
  • Decagon – It has 10 Sides.

Other polygons

These are 2D shapes, and they are polygons, yet not standard polygons:

  • Quadrilateral: It is a four-sided two-dimensional figure with a sum of its interior angles equal to 360 degrees.
  • Rectangle: It is a four-sided two-dimensional figure with two pairs of equal sides. Every interior angle is at 90 degrees.

Some simple examples of plane shapes we usually see in daily routines include tortilla chips, signboards, paper sheets, stamps, tiles, and various others. Now you can easily differentiate between a plane and a 3-dimensional object.

We hope you now know various examples of planes used in geometry and its different uses. Stay connected to learn more about Basic and Advanced Geometry in simplified ways only at Cuemath.


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