This discussion is about the most common 2-dimensional shapes present in the surroundings. This concept will help them to identify the shapes with their names.

In this learning concept, the student will learn about

- what is a 2-dimensional shape
- 2 and 3-dimensional shapes
- what is circle
- what is a rectangle
- what is square
- What is an oval

Each concept is explained to class 1 maths students with examples, illustrations and a mind map is added at the end to summarize the idea. Two printable worksheets with solutions of 2-D shapes are attached at the end of the page for the students to practice. Download the worksheet to test your knowledge.

Every day we see different shapes around us. Each shape has different dimensions. A shape can be defined as the form of an object or its outline, outer boundary or outer surface.

Based on the dimensions we can classify shapes as:

**1.Two-dimensional shapes (2-D shapes)**

**2.Three-dimensional shapes (3-D shapes)**

- 2-D means
**‘two-dimensional’.** - 2-D shapes or Two-dimensional shapes are
**flat plane figures or a shape that has two dimensions.** - 2-D shapes have
**no thickness.** - To classify 2-D shapes we look
**sides and corners**of the shapes.

**There are various 2-D shapes.**

A circle is a 2-D shape with** one curved side** and **no corners.**

**Example:**

The shapes of the following objects look like a circle.

- A 2-D shape that is obtained by dividing a circle into two equal parts.
- Exactly half of a circle.
- A semi-circle has
**one straight side**and**one curved side.**

**Example:**

The shapes of the following objects look like a semi-circle.

- An oval is a 2-D shape that looks like the outline of an egg.
- An oval is a round shape that is elongated rather than perfectly round, as a circle is.

**Example:**

The shapes of the following objects look like an oval.

A triangle is a 2-D shape that has** 3 sides** and **3 corners.**

**Example:**

The shapes of the following objects look like a triangle.

A square is a 2-D shape with **4 sides and 4 corners,** and** all sides are equal.**

**Example:**

The shapes of the following objects look like a square.

A rectangle is a 2-D shape with **4 sides and 4 corners,** and** opposite sides are equal.**

**Example:**

The shapes of the following objects look like a rectangle.

Following are some other types of 2-D shapes.

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