This learning concept will help the students to recall the 2-dimensional shapes of geometry. Also, the students will get to know about open and closed figures.

In this learning concept, students will learn to

- Identify the open figure and closed figure
- Classify circle, square, triangle, rectangle
- Define triangle, circle, square, rectangle

The learning concept is explained to class 3 students with examples, illustrations, and a concept map. At the end of the page, two printable worksheets for class 3 with solutions are attached for the students.

Download the worksheets of 2-dimensional shapes and solutions to assess our knowledge of the concept.

In geometry, 2-D shapes are completely flat and have only two dimensions – length and width. They do not have any thickness and can be measured only by the two dimensions. There are different types of 2-D shapes, which are open figures and closed figures.

**Open and Closed Figures**

**Open Figure:**

Open figures do not begin and end at the same point.

**Closed Figure**

**Closed figures begin and end and the same point.**

In our surroundings, we could see some different types of closed figures commonly. Here we discuss some of these closed figures.

These are triangles, squares, rectangles and circles.

A triangle is a 2D shape with three sides and three corners.

Traffic signs, pizza, sandwiches etc are in the shape of a triangle.

A rectangle is a 2D shape with four sides and four corners.

A blackboard, door, brick etc are in the shape of a rectangle.

A square is a 2-D shape with four sides and four corners. All sides of squares are equal.

The chessboard, bread etc are in the shape of a square.

A circle is a closed 2-D shape made up of a curved line with no sides and no corners. A circle has various parts like centre, radius, diameter, circumference, and so on.

In real life coins, plates, pizza, etc. are examples of the circle.

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