Plane Shapes - 2D Shapes, Different Types, Properties, Examples ...

Plane Shapes

A shape can be defined as the boundary or outline of an object.  A plane shape is a two-dimensional closed figure that has no thickness. A plane in geometry is a flat surface that extends into infinity in all directions. It has infinite width and length, zero thickness, and zero curvature. It is actually difficult to imagine a plane in real life, there is nothing that we can use as a real example of a geometric plane. We can see an example of a plane in coordinate geometry where the position of any given point on a plane is defined with the help of an ordered pair of numbers, or coordinates. Coordinates show the correct location of points in the plane. Let us learn about plane shapes in detail.

1.	What are Open and Closed Shapes?
2.	Sides and Corners of Shapes
3.	What are the Different 2D Shapes?
4.	What are Polygons?
5.	Solved Examples on Plane Shapes
6.	Practice Questions on Plane Shapes
7.	FAQs on Plane Shapes

What are Open and Closed Shapes?

A closed figure can be made of straight or curved lines. It has no opening whereas an open figure is made of either straight or curved lines. However, it has at least one opening. Example of closed and open shapes are shown in the image below.

      

Sides and Corners of Shapes

We have learned what plane shapes are and what they look like. Plane shapes are two-dimensional, e.g., squares, triangles, and circles. The straight lines that make up a plane shape are called sides. The points where two sides meet are called corners.

What are the Different 2D Shapes?

Observe a sheet of paper. You can see how long and how wide it is. These are the two dimensions known as length and width. A two-dimensional shape does not have any depth. 2D shapes are closed shapes that are created by joining straight/curved lines together. The common 2D shapes are:

Shape Name	Number of Sides	Number of Corners	Property
Square	4	4	A square is a quadrilateral with four equal sides and four right angles.
Rectangle	4	4	A rectangle is a quadrilateral with two pairs of equal and parallel opposite sides and four right angles.
Circle	0	0	A circle is formed by the set of points that are at a constant or fixed distance (radius) from a fixed point (center) in the plane.
Triangle	3	3	A triangle is a closed figure or shape with 3 sides, 3 angles, and 3 vertices.
Polygon	3 and more than 3 sides	3 or more than 3 corners	A polygon is a closed two-dimensional figure with three or more straight lines.
Oval	0	0	Oval has no straight line, or corner, or side to it. It is a closed shape made of curved lines.

Let us learn about polygons.

What are Polygons?

In geometry, a polygon is a closed two-dimensional figure with three or more straight lines. The Greek word ‘Polygon’ consists of Poly meaning ‘many’ and gon meaning ‘angle.’ We see many different polygons around us. For example, Have you ever seen a honeycomb? Can you guess ideally, how many sides a honeycomb could have? A honeycomb is hexagonal in shape. You can very well relate the shape of a 6-sided polygon with a honeycomb.

The types of polygons are categorized into three major forms:

• Regular or Irregular
• Concave or Convex
• Simple or Complex

Look at a few different types of polygons shown in the below image.

Important Notes

• Quadrilaterals are four-sided closed figures made of straight lines.
• Polygons are closed geometric shapes made of straight lines. They are named after the number of sides they have.

Related Topics on Plane Shapes

• Rectangle
• Circles
• Triangles
• Square

Important Topics   Is Square a Rectangle Geometric Shapes Polygon Shape