We all like an ice cream cone, the bigger the better!

To find out how much ice cream we can get into a cone so that it is level with the top, we need to work out the **volume.**

As ever with shape questions, there is a formula to help us:

It can be a bother having to learn so many formulas, but let us look at this closely.

A cone has a **circular** shape, so the formula for finding an **area of a circle **is in it: **π ****x radius x radius**

Now we want to cram as much ice cream into this cone as possible, so we are very interested in its **height.**

So far we have **π ****x radius² x height**.

This just leaves us with the first part of the formula to learn which is **1/3.**

One way to remember this is that there are 3 things to do already, I just have to remember 1 more!

When working with the volume of more complex shapes, use the **π** button on your calculator because it will use **π **to so many decimal places. If you use 3.142 or 3.14, answers may differ slightly.

Let's get started.

**Find the volume of this cone.**

Just beware of a few things to look out for:

Sometimes you are given the** diameter **of the cone, remember to** halve i**t to get the** radius.**

Sometimes you are given** two** heights, a slanted height and a vertical height. You always work with the **vertical height** when finding the volume.

Volume is always measured in **units³**

The beauty of this is that you can just put the whole thing into your calculator in one go:

The radius is half of the diameter: 3 cm and the height is 11 cm.

**1 ÷ 3 x ****π ****x**** 3² (or 3 x 3) x 11 = 103.67 cm² ** (rounded to 2 decimal places or 2 d.p)

Now let's try some questions.