# Shape - Definition and Meaning

## What is a shape?

A shape is a figure or surface area enclosed by a boundary. For example, circle, triangle, rectangle etc.

The shapes are formed by curved or straight lines.

The shapes can be open or closed.

They can be two-dimensional or three-dimensional.

## Types of geometric shapes

The attributes of the shapes make them similar or different. Example, a triangle has 3 sides and a rectangle has 4 sides.

The defining attributes do not change for a shape whereas non-defining may change.

## Dimensions of Geometric Shapes

Geometric shapes are classified according to the number of dimensions they exhibit. Some shapes exhibit only two dimensions (height and width) and some exhibit three dimensions (height, width and depth).

A point is zero-dimensional as it has no dimension (no length, height or width).

A line segment/line is one-dimensional as its length is measured only in one direction.

Flat figures drawn on a plane whose lengths are measured in two directions (height and width) are called two-dimensional shapes. For example; rectangle, circle, triangle etc.

Solids with three dimensions (height, depth and length) are called three-dimensional figures. For example, cube, cuboid, prism etc.

Two-dimensional shapes are formed by combination of line segments and/or curves.

Three-dimensional shapes are formed by combinations of 2D-faces.

The arrangement and the number of lines or faces result in different types of 2D and 3D shapes.

Here is a list of basic geometric shapes along with names and pictures taught to kids in elementary math.

The arrangement and the number of lines or faces result in different types of 2D and 3D shapes.

Here is a list of basic geometric shapes along with names and pictures taught to kids in elementary math.

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