Shapes

Two-dimensional Shapes

Shapes:

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)

Two-dimensional Shapes (2-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.

1.Circle:

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.

2.Semi-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.

3.Oval:

• 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.

4.Triangle:

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.

5. Square

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.

6. Rectangle

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.