ABCD is a regular tetrahedron and the points P, Q, R and S are the midpoints of the edges AB, BD, CD and CA. Prove that PQRS is a square.
Start with a large square, join the midpoints of its sides, you'll see four right angled triangles. Remove these triangles, a second square is left. Repeat the operation. What happens?
The whole set of tiles is used to make a square. This has a green and blue border. There are no green or blue tiles anywhere in the square except on this border. How many tiles are there in the set?
What is the greatest number of squares you can make by overlapping
What would be the smallest number of moves needed to move a Knight
from a chess set from one corner to the opposite corner of a 99 by
99 square board?
It is possible to dissect any square into smaller squares. What is
the minimum number of squares a 13 by 13 square can be dissected
On the graph there are 28 marked points. These points all mark the
vertices (corners) of eight hidden squares. Can you find the eight
What can you see? What do you notice? What questions can you ask?
What shape has Harry drawn on this clock face? Can you find its
area? What is the largest number of square tiles that could cover
Here are four tiles. They can be arranged in a 2 by 2 square so that this large square has a green edge. If the tiles are moved around, we can make a 2 by 2 square with a blue edge... Now try to. . . .
Square It game for an adult and child. Can you come up with a way of always winning this game?
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.
These points all mark the vertices (corners) of ten hidden squares.
Can you find the 10 hidden squares?
A tilted square is a square with no horizontal sides. Can you
devise a general instruction for the construction of a square when
you are given just one of its sides?
A group activity using visualisation of squares and triangles.
What is the total area of the four outside triangles which are
outlined in red in this arrangement of squares inside each other?
This collection of resources is designed to enable children to
explore concepts and ideas associated with squares.
Can you work out the area of the inner square and give an
explanation of how you did it?
It's easy to work out the areas of most squares that we meet, but
what if they were tilted?
A 2 by 3 rectangle contains 8 squares and a 3 by 4 rectangle
contains 20 squares. What size rectangle(s) contain(s) exactly 100
squares? Can you find them all?
A man paved a square courtyard and then decided that it was too
small. He took up the tiles, bought 100 more and used them to pave
another square courtyard. How many tiles did he use altogether?
Can you dissect a square into: 4, 7, 10, 13... other squares? 6, 9,
12, 15... other squares? 8, 11, 14... other squares?
This practical challenge invites you to investigate the different
squares you can make on a square geoboard or pegboard.
How many centimetres of rope will I need to make another mat just
like the one I have here?
Cut a square of paper into three pieces as shown. Now,can you use
the 3 pieces to make a large triangle, a parallelogram and the
Investigate all the different squares you can make on this 5 by 5
grid by making your starting side go from the bottom left hand
point. Can you find out the areas of all these squares?
What is the smallest number of tiles needed to tile this patio? Can
you investigate patios of different sizes?
Rectangles are considered different if they vary in size or have different locations. How many different rectangles can be drawn on a chessboard?
How many ways can you find of tiling the square patio, using square
tiles of different sizes?
A circle with the radius of 2.2 centimetres is drawn touching the sides of a square. What area of the square is NOT covered by the circle?
The diagram shows a 5 by 5 geoboard with 25 pins set out in a square array. Squares are made by stretching rubber bands round specific pins. What is the total number of squares that can be made on a. . . .
Just four procedures were used to produce a design. How was it
done? Can you be systematic and elegant so that someone can follow
What is the greatest number of counters you can place on the grid below without four of them lying at the corners of a square?
This activity investigates how you might make squares and pentominoes from Polydron.
Can you recreate squares and rhombuses if you are only given a side
or a diagonal?
This article for teachers suggests activities based on pegboards, from pattern generation to finding all possible triangles, for example.
This interactivity allows you to sort logic blocks by dragging their images.
This problem challenges you to work out what fraction of the whole area of these pictures is taken up by various shapes.
Are all the possible combinations of two shapes included in this
set of 27 cards? How do you know?
Have a good look at these images. Can you describe what is happening? There are plenty more images like this on NRICH's Exploring Squares CD.
Using LOGO, can you construct elegant procedures that will draw
this family of 'floor coverings'?
Look at how the pattern is built up - in that way you will know how
to break the final pattern down into more manageable pieces.
Investigate how this pattern of squares continues. You could
measure lengths, areas and angles.
Creating designs with squares - using the REPEAT command in LOGO.
This requires some careful thought on angles
Can you use LOGO to create this star pattern made from squares.
Only basic LOGO knowledge needed.
Can you use LOGO to create a systematic reproduction of a basic
design? An introduction to variables in a familiar setting.
This LOGO Challenge emphasises the idea of breaking down a problem
into smaller manageable parts. Working on squares and angles.
Nine squares with side lengths 1, 4, 7, 8, 9, 10, 14, 15, and 18 cm can be fitted together to form a rectangle. What are the dimensions of the rectangle?
A Short introduction to using Logo. This is the first in a twelve part series.