3D shapes are shapes that have **3 dimensions** (**height**, **length **and **depth**)

## Some vocab you need to know:

**Face(s):**face or faces are the “sides” of a 3D shape, for example: a cube has 6 faces.**Edge(s):**edge or edges are the lines between a face and another or the lines that connect an vertex by another.**Vertex (Pl: vertices):**a vertex is a corner between 2 edges (lines).**Volume:**volume is the amount that we can feel inside the shape, (the space inside the shape).**Apex(es):**the highest point.

## What is the difference between 3D and 2D shapes?

3D shapes have got **3-dimensions **(**height**, **depth **and **length**) but 2D have shapes got **2 dimensions **only (**width**and **height**).

Basically, that means **3D shapes** are shapes that we can put something inside of, but** 2D shapes** are **flat shapes** so we can’t put some thing **inside them**, however we can put something **on them** (like we can fill a square by a colour on a paper).

## Here are some basic 3D-shapes:

This 3D shape is** a cube**, it has **6 squared faces**, **12 edges** and **8 vertices**.

A cube is a 3D object from the square.

To workout the **volume **of a cube we can multiply the **height **by the **width** by the** depth**.

**V**= **Height **ˣ **Width **ˣ **Depth**

This shape is a **cylinder**, it has **3 faces** (2-circular and 1-rectangle) and 2 edges

The bottom circular face is called **“the base”**

A cylinder is the a 3D object from a circle.

To work out the **volume **of a **cylinder** you can use this formula : **V **=**π r ^{2} h**

This 3d shape is **a cuboid**, it has **6-faces**, **8-edges** and **8 vertices**.

A cuboid is a 3D object made from **rectangles**.

To calculate **the volume** of a cuboid we multiply the height by the length by the depth. **V **= **Height **ˣ **Length **ˣ **Depth**

This 3d Shape is** **a** cone**, It has **2 faces** and one **apex**.

The bottom face called “**the base**“.

To workout the **volume** of a cone : **V** = **π** **R**^{3} **H/3**

This 3d Shape is a **squared based pyramid**, it has **5 faces **(1 squared base and 4 triangular faces). It has one **apex**.

To workout the **volume** of a square based pyramid: **V** = **LW** **h/3 **

L = length W=width H=height