There are **49** NRICH Mathematical resources connected to **2D shapes and their properties**, you may find related items under Angles, Polygons, and Geometrical Proof.

Challenge Level

Are these statements relating to calculation and properties of shapes always true, sometimes true or never true?

Challenge Level

Shapes are added to other shapes. Can you see what is happening? What is the rule?

Challenge Level

This problem is intended to get children to look really hard at something they will see many times in the next few months.

Challenge Level

The computer has made a rectangle and will tell you the number of spots it uses in total. Can you find out where the rectangle is?

Challenge Level

These pictures were made by starting with a square, finding the half-way point on each side and joining those points up. You could investigate your own starting shape.

Challenge Level

This activity focuses on similarities and differences between shapes.

Challenge Level

This challenge invites you to create your own picture using just straight lines. Can you identify shapes with the same number of sides and decorate them in the same way?

Challenge Level

This task develops spatial reasoning skills. By framing and asking questions a member of the team has to find out what mathematical object they have chosen.

Challenge Level

Can you each work out what shape you have part of on your card? What will the rest of it look like?

Challenge Level

What shape is the overlap when you slide one of these shapes half way across another? Can you picture it in your head? Use the interactivity to check your visualisation.

Challenge Level

The red ring is inside the blue ring in this picture. Can you rearrange the rings in different ways? Perhaps you can overlap them or put one outside another?

Challenge Level

These rectangles have been torn. How many squares did each one have inside it before it was ripped?

Challenge Level

Choose the size of your pegboard and the shapes you can make. Can you work out the strategies needed to block your opponent?

Challenge Level

Use the isometric grid paper to find the different polygons.

Challenge Level

Arrange the shapes in a line so that you change either colour or shape in the next piece along. Can you find several ways to start with a blue triangle and end with a red circle?

Challenge Level

Can you match the Venn diagram with the Carroll diagram that shows the same information?

In this article for primary teachers, Ems explores ways to develop mathematical flexibility through geometry.

Challenge Level

In this game, you turn over two cards and try to draw a triangle which has both properties.

Challenge Level

Can you sketch triangles that fit in the cells in this grid? Which ones are impossible? How do you know?

Challenge Level

Here is a selection of different shapes. Can you work out which ones are triangles, and why?

Challenge Level

What shape is made when you fold using this crease pattern? Can you make a ring design?

Challenge Level

'What Shape?' activity for adult and child. Can you ask good questions so you can work out which shape your partner has chosen?

Challenge Level

Can you spot circles, spirals and other types of curves in these photos?

Challenge Level

Look at some of the patterns in the Olympic Opening ceremonies and see what shapes you can spot.

Challenge Level

If these balls are put on a line with each ball touching the one in front and the one behind, which arrangement makes the shortest line of balls?

Challenge Level

What do you think is the same about these two Logic Blocks? What others do you think go with them in the set?

Challenge Level

Are all the possible combinations of two shapes included in this set of 27 cards? How do you know?

This article describes investigations that offer opportunities for children to think differently, and pose their own questions, about shapes.

Challenge Level

A cheap and simple toy with lots of mathematics. Can you interpret the images that are produced? Can you predict the pattern that will be produced using different wheels?

Challenge Level

Investigate these hexagons drawn from different sized equilateral triangles.

Challenge Level

Learn how to draw circles using Logo. Wait a minute! Are they really circles? If not what are they?

Challenge Level

Look at the mathematics that is all around us - this circular window is a wonderful example.

Challenge Level

Can you help the children in Mrs Trimmer's class make different shapes out of a loop of string?

Challenge Level

Have you ever noticed the patterns in car wheel trims? These questions will make you look at car wheels in a different way!

Challenge Level

What mathematical words can be used to describe this floor covering? How many different shapes can you see inside this photograph?

Challenge Level

Arrange any number of counters from these 18 on the grid to make a rectangle. What numbers of counters make rectangles? How many different rectangles can you make with each number of counters?

This article for pupils gives some examples of how circles have featured in people's lives for centuries.

Read about David Hilbert who proved that any polygon could be cut up into a certain number of pieces that could be put back together to form any other polygon of equal area.

Read all about the number pi and the mathematicians who have tried to find out its value as accurately as possible.

Challenge Level

What shaped overlaps can you make with two circles which are the same size?

Challenge Level

Use the interactivity to make this Islamic star and cross design. Can you produce a tessellation of regular octagons with two different types of triangle?

Challenge Level

Explore patterns based on a rhombus. How can you enlarge the pattern - or explode it?

Challenge Level

The challenge is to produce elegant solutions. Elegance here implies simplicity. The focus is on rhombi, in particular those formed by jointing two equilateral triangles along an edge.

Challenge Level

How can these shapes be cut in half to make two shapes the same shape and size? Can you find more than one way to do it?

Challenge Level

How many trapeziums, of various sizes, are hidden in this picture?

Challenge Level

The image in this problem is part of a piece of equipment found in the playground of a school. How would you describe it to someone over the phone?

Challenge Level

An activity making various patterns with 2 x 1 rectangular tiles.

Challenge Level

Can you make a rectangle with just 2 dominoes? What about 3, 4, 5, 6, 7...?

Challenge Level

Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?