# The Amazing Shapes “2D & 3D”

Updated on: Educator Review By: Michelle Connolly

### What are 2D shapes?

Shapes are shapes with two dimensions “width and height”. 2D shapes are flat and cannot be physically held, because they have no depth.

### What is Polygon?

Polygon is a 2-dimensional shape. It is a flat shape with straight sides, and its shape is “closed” (all the lines connect up). A regular shape has all sides the same length and all interior angles the same size. An irregular shape has different lengths sides and/or interior angles.

#### Here are some examples of 2D Shapes:

Triangle – Square – Kite – Rectangle – Trapezium – Parallelogram – Pentagon – Hexagon – Octagon – Decagon – Nonagon – Rhombus

Circle, oval, and Ellipse are 2D shapes, but are not polygons because they have curves.

### What are Regular and Irregular 2D Shapes?

A 2D shape can be classified as regular or irregular based on the length and the interior angles:

#### -A 2D Regular Shapes:

All sides in 2D shapes are equal in length and all its interior angles measure the same.

#### -A 2D Irregular Shapes:

All sides in 2D shapes are of unequal length and all its angles are of unequal measures.

### 3D Shapes

#### What are the 3D shapes?

3D shapes are shapes with three dimensions, width, height and depth. 3D shapes can be physically held.

#### Properties of 3D Shapes

3D shapes have faces (sides), edges and vertices (corners).

#### Faces

A face is a flat or curved surface with a 3D shape.

#### Edges

An edge is where two faces meet.

#### Vertices

A vertex is a corner where edges meet. The plural is vertices.

#### Types of 3D Shapes:

Sphere – Hemisphere – Cone – Tetrahedron or Triangular based pyramid – Cylinder – Triangular prism – Hexagonal prism – Pentagonal prism – Cube – Cuboid.

You can mix between some shapes like:

#### 1- The Cone and The Pyramids:

The difference between them is that the cone has a circular base and can roll on its sides.

#### 2- The Cone and The Cylinder :

You can find the difference between them through their rolling point. The circle rolls in a circle, but the cylinder rolls in a straight line.

#### 2D Shapes:

2D means (Two Dimensional) length and width. 2D figures are plane shapes. They have areas but not volume. Straight lines make up the sides of the 2D shapes. They are drawn using X-axes, and Y-axes. 2D shapes are used to give a simple view of an object. All edges of 2D shapes are visible. It is easy to draw and explain details in 2D shapes. It is easy to draw 2D Shapes.

For Example Circle, oval, triangle, etc.

#### 3D Shapes:

3D means (Three Dimensional) length, width, and height or depth. 3D shapes do have areas and volume. 3D shapes are drawn using X-axes, Y-axes, and Z-axes. 3D shapes are used to give an architectural view of an object. In 3D shapes, some of the edges are hidden. In 3D shapes, only outer dimensions can be explained. The details become difficult in 3d shapes. 3D shapes are complex in the drawing.

For Example sphere, cube, cuboid, etc.