Parallelogram - another two dimensional shape that we might easily recognise, but not always remember its name.

It has **opposite parallel sides**, which may help with remembering the name.

What** **examples can you think of that we might see in everyday life?

Believe it or not, you can be two things at once!

For example, a **square** has two sets of parallel sides, so it is also a **parallelogram** but we call it a **square**. The same goes for a** rectangle**.

Basically, a **parallelogram** is a **four-sided shape with opposite sides parallel and equal in length** (the same as a square or rectangle).

Mathematicians can be awkward and make a four-sided shape look different just for fun, so that's how we arrive at** **parallelogram.

There are all sorts of reasons we might need to know the area of a parallelogram. So how do we do that?

First of all, we know that the sides of a parallelogram are **not always **the same length.

Two sides will have one length and the other two sides might have a different length.

As with a lot of shape work, there is a **formula **that you need to learn. So here goes:

**Area of a parallelogram = base x height**

You may recognise that it is the same as the formula for the area of a square and a rectangle.

Find the area of the parallelogram below:

Area = base x height

**Hang on!! **We **cannot **work out the area of the parallelogram above as we** only know the slanted height!**

Let's try this one instead.

Look out! You need to work with the **vertical height,** not the slanted height.

12 x 5 = 60 cm²

As we are working with area, units are always squared. e.g **cm², m²**

What a bargain - one formula for three shapes.