What do you understand by a plane closed figure?

Hint: Here we have to explain what a plane closed figure is. For this we will firstly understand what a plane is, then we will understand what a closed figure is and finally we will conclude what a plane closed figure is. There is also a perfect definition for a plane closed figure which we can directly use to explain it.

Complete step-by-step solution:
We have to understand what a plane closed figure is so we will start by writing down the definition of all the terms in it.
Firstly we will explain what a plane is as follows:
A Plane is a two-dimensional flat surface that can extend infinitely as far as possible.
Then we will explain what a closed figure is as follows:
It is a figure that begins and ends at the same point or in other words we can say that a shape or figures whose line segment and curves are connected are known as closed figures.
So we can conclude that
Any geometrical plane figure that is bounded by straight or curved lines on a plane is known as a plane closed figure. A Square, Circle or Rectangle are some examples of plane closed figures.


Note: A plane closed figure is very useful in many calculations of mathematics. There are many sets of predefined figures that are generally used in solving big problems of mathematics such as- A polygon is a plane figure which has a fixed number of lines which are so connected that it forms a closed mathematical shape.