Choose a box and work out the smallest rectangle of paper needed to wrap it so that it is completely covered.
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?
What is the total area of the four outside triangles which are outlined in red in this arrangement of squares inside each other?
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 largest number of circles we can fit into the frame without them overlapping? How do you know? What will happen if you try the other shapes?
Arrange your fences to make the largest rectangular space you can. Try with four fences, then five, then six etc.
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 into?
Is it possible to remove ten unit cubes from a 3 by 3 by 3 cube made from 27 unit cubes so that the surface area of the remaining solid is the same as the surface area of the original 3 by 3 by 3. . . .
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. . . .
Explore this interactivity and see if you can work out what it does. Could you use it to estimate the area of a shape?
This rectangle is cut into five pieces which fit exactly into a triangular outline and also into a square outline where the triangle, the rectangle and the square have equal areas.
What do these two triangles have in common? How are they related?
These practical challenges are all about making a 'tray' and covering it with paper.
Points P, Q, R and S each divide the sides AB, BC, CD and DA respectively in the ratio of 2 : 1. Join the points. What is the area of the parallelogram PQRS in relation to the original rectangle?
A follow-up activity to Tiles in the Garden.
Do you know how to find the area of a triangle? You can count the squares. What happens if we turn the triangle on end? Press the button and see. Try counting the number of units in the triangle now. . . .
What is the largest 'ribbon square' you can make? And the smallest? How many different squares can you make altogether?
You can move the 4 pieces of the jigsaw and fit them into both outlines. Explain what has happened to the missing one unit of area.
Can you maximise the area available to a grazing goat?
Draw some isosceles triangles with an area of $9$cm$^2$ and a vertex at (20,20). If all the vertices must have whole number coordinates, how many is it possible to draw?
If you have only 40 metres of fencing available, what is the maximum area of land you can fence off?
Can you draw a square in which the perimeter is numerically equal to the area?
Use the interactivity to find all the different right-angled triangles you can make by just moving one corner of the starting triangle.
Look at the mathematics that is all around us - this circular window is a wonderful example.
A red square and a blue square overlap so that the corner of the red square rests on the centre of the blue square. Show that, whatever the orientation of the red square, it covers a quarter of the. . . .
What can you say about these shapes? This problem challenges you to create shapes with different areas and perimeters.
My local DIY shop calculates the price of its windows according to the area of glass and the length of frame used. Can you work out how they arrived at these prices?
In this game for two players, you throw two dice and find the product. How many shapes can you draw on the grid which have that area or perimeter?
This article for teachers gives some food for thought when teaching ideas about area.
Can you help the children find the two triangles which have the lengths of two sides numerically equal to their areas?
An investigation that gives you the opportunity to make and justify predictions.
How many tiles do we need to tile these patios?
It's easy to work out the areas of most squares that we meet, but what if they were tilted?
Explore one of these five pictures.
How many centimetres of rope will I need to make another mat just like the one I have here?
What is the smallest number of tiles needed to tile this patio? Can you investigate patios of different sizes?
What are the areas of these triangles? What do you notice? Can you generalise to other "families" of triangles?
Cut differently-sized square corners from a square piece of paper to make boxes without lids. Do they all have the same volume?
Investigate the area of 'slices' cut off this cube of cheese. What would happen if you had different-sized block of cheese to start with?
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?
This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.
These rectangles have been torn. How many squares did each one have inside it before it was ripped?
Make an eight by eight square, the layout is the same as a chessboard. You can print out and use the square below. What is the area of the square? Divide the square in the way shown by the red dashed. . . .
How many ways can you find of tiling the square patio, using square tiles of different sizes?
Grandpa was measuring a rug using yards, feet and inches. Can you help William to work out its area?
You have a 12 by 9 foot carpet with an 8 by 1 foot hole exactly in the middle. Cut the carpet into two pieces to make a 10 by 10 foot square carpet.
Semicircles are drawn on the sides of a rectangle ABCD. A circle passing through points ABCD carves out four crescent-shaped regions. Prove that the sum of the areas of the four crescents is equal to. . . .
What is the shape and dimensions of a box that will contain six cups and have as small a surface area as possible.
Investigate the different ways of cutting a perfectly circular pie into equal pieces using exactly 3 cuts. The cuts have to be along chords of the circle (which might be diameters).
Determine the total shaded area of the 'kissing triangles'.