What is the total area of the four outside triangles which are outlined in red in this arrangement of squares inside each other?
Draw three straight lines to separate these shapes into four groups - each group must contain one of each shape.
Try this interactive strategy game for 2
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 this area?
How many different ways can you find of fitting five hexagons together? How will you know you have found all the ways?
A shape and space game for 2,3 or 4 players. Be the last person to be able to place a pentomino piece on the playing board. Play with card, or on the computer.
A group activity using visualisation of squares and triangles.
This practical problem challenges you to make quadrilaterals with a loop of string. You'll need some friends to help!
How many different symmetrical shapes can you make by shading triangles or squares?
Investigate how the four L-shapes fit together to make an enlarged L-shape. You could explore this idea with other shapes too.
Can you cut a regular hexagon into two pieces to make a parallelogram? Try cutting it into three pieces to make a rhombus!
What is the greatest number of squares you can make by overlapping three squares?
A game has a special dice with a colour spot on each face. These three pictures show different views of the same dice. What colour is opposite blue?
What is the relationship between these first two shapes? Which shape relates to the third one in the same way? Can you explain why?
Slide the pieces to move Khun Phaen past all the guards into the position on the right from which he can escape to freedom.
Can you explain why it is impossible to construct this triangle?
A triangle ABC resting on a horizontal line is "rolled" along the line. Describe the paths of each of the vertices and the relationships between them and the original triangle.
Generate three random numbers to determine the side lengths of a triangle. What triangles can you draw?
Find a way to cut a 4 by 4 square into only two pieces, then rejoin the two pieces to make an L shape 6 units high.
Can you work out what kind of rotation produced this pattern of pegs in our pegboard?
A game for 1 or 2 people. Use the interactive version, or play with friends. Try to round up as many counters as possible.
A game for 2 players. Given a board of dots in a grid pattern, players take turns drawing a line by connecting 2 adjacent dots. Your goal is to complete more squares than your opponent.
How many different triangles can you make on a circular pegboard that has nine pegs?
Make a flower design using the same shape made out of different sizes of paper.
How many DIFFERENT quadrilaterals can be made by joining the dots on the 8-point circle?
Seven small rectangular pictures have one inch wide frames. The frames are removed and the pictures are fitted together like a jigsaw to make a rectangle of length 12 inches. Find the dimensions of. . . .
How can the same pieces of the tangram make this bowl before and after it was chipped? Use the interactivity to try and work out what is going on!
Mathematics is the study of patterns. Studying pattern is an opportunity to observe, hypothesise, experiment, discover and create.
In how many ways can you fit all three pieces together to make shapes with line symmetry?
Where can you put the mirror across the square so that you can still "see" the whole square? How many different positions are possible?
Four rods, two of length a and two of length b, are linked to form a kite. The linkage is moveable so that the angles change. What is the maximum area of the kite?
The diagram shows a very heavy kitchen cabinet. It cannot be lifted but it can be pivoted around a corner. The task is to move it, without sliding, in a series of turns about the corners so that it. . . .
This article looks at levels of geometric thinking and the types of activities required to develop this thinking.
Can you fit the tangram pieces into the silhouette of the junk?
The triangle ABC is equilateral. The arc AB has centre C, the arc BC has centre A and the arc CA has centre B. Explain how and why this shape can roll along between two parallel tracks.
Exchange the positions of the two sets of counters in the least possible number of moves
These are pictures of the sea defences at New Brighton. Can you work out what a basic shape might be in both images of the sea wall and work out a way they might fit together?
When dice land edge-up, we usually roll again. But what if we didn't...?
An extension of noughts and crosses in which the grid is enlarged and the length of the winning line can to altered to 3, 4 or 5.
Choose a box and work out the smallest rectangle of paper needed to wrap it so that it is completely covered.
Imagine a 4 by 4 by 4 cube. If you and a friend drill holes in some of the small cubes in the ways described, how many will not have holes drilled through them?
In how many ways can you fit two of these yellow triangles together? Can you predict the number of ways two blue triangles can be fitted together?
A game for two players on a large squared space.
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.
Why do you think that the red player chose that particular dot in this game of Seeing Squares?
Can you picture where this letter "F" will be on the grid if you flip it in these different ways?
Imagine a 3 by 3 by 3 cube made of 9 small cubes. Each face of the large cube is painted a different colour. How many small cubes will have two painted faces? Where are they?
Can you work out what shape is made by folding in this way? Why not create some patterns using this shape but in different sizes?
What happens to the area of a square if you double the length of the sides? Try the same thing with rectangles, diamonds and other shapes. How do the four smaller ones fit into the larger one?
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?