Imagine different shaped vessels being filled. Can you work out
what the graphs of the water level should look like?
Can you draw the height-time chart as this complicated vessel fills
Analyse these beautiful biological images and attempt to rank them in size order.
How efficiently can you pack together disks?
Explore one of these five pictures.
ABC and DEF are equilateral triangles of side 3 and 4 respectively. Construct an equilateral triangle whose area is the sum of the area of ABC and DEF.
An activity for high-attaining learners which involves making a new cylinder from a cardboard tube.
Three rods of different lengths form three sides of an enclosure
with right angles between them. What arrangement maximises the area
Can you rank these sets of quantities in order, from smallest to largest? Can you provide convincing evidence for your rankings?
What is the shape and dimensions of a box that will contain six cups and have as small a surface area as possible.
Can you find a general rule for finding the areas of equilateral
triangles drawn on an isometric grid?
A follow-up activity to Tiles in the Garden.
Triangle ABC is right angled at A and semi circles are drawn on all three sides producing two 'crescents'. Show that the sum of the areas of the two crescents equals the area of triangle ABC.
Place four pebbles on the sand in the form of a square. Keep adding as few pebbles as necessary to double the area. How many extra pebbles are added each time?
If you have only 40 metres of fencing available, what is the maximum area of land you can fence off?
What is the ratio of the area of a square inscribed in a semicircle to the area of the square inscribed in the entire circle?
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. . . .
Manufacturers need to minimise the amount of material used to make
their product. What is the best cross-section for a gutter?
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. . . .
Can you maximise the area available to a grazing goat?
My measurements have got all jumbled up! Swap them around and see
if you can find a combination where every measurement is valid.
A hallway floor is tiled and each tile is one foot square. Given
that the number of tiles around the perimeter is EXACTLY half the
total number of tiles, find the possible dimensions of the hallway.
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?
Take any rectangle ABCD such that AB > BC. The point P is on AB
and Q is on CD. Show that there is exactly one position of P and Q
such that APCQ is a rhombus.
Follow the instructions and you can take a rectangle, cut it into 4 pieces, discard two small triangles, put together the remaining two pieces and end up with a rectangle the same size. Try it!
Prove that a triangle with sides of length 5, 5 and 6 has the same area as a triangle with sides of length 5, 5 and 8. Find other pairs of non-congruent isosceles triangles which have equal areas.
Can you show that you can share a square pizza equally between two
people by cutting it four times using vertical, horizontal and
diagonal cuts through any point inside the square?
The area of a square inscribed in a circle with a unit radius is,
satisfyingly, 2. What is the area of a regular hexagon inscribed in
a circle with a unit radius?
This shape comprises four semi-circles. What is the relationship
between the area of the shaded region and the area of the circle on
AB as diameter?
Six circular discs are packed in different-shaped boxes so that the
discs touch their neighbours and the sides of the box. Can you put
the boxes in order according to the areas of their bases?
Investigate how this pattern of squares continues. You could
measure lengths, areas and angles.
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
Can you work out the area of the inner square and give an
explanation of how you did it?
In this problem we are faced with an apparently easy area problem,
but it has gone horribly wrong! What happened?
Draw two circles, each of radius 1 unit, so that each circle goes
through the centre of the other one. What is the area of the
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
Have a go at creating these images based on circles. What do you notice about the areas of the different sections?
Can you prove this formula for finding the area of a quadrilateral from its diagonals?
Derive a formula for finding the area of any kite.
Can you choose your units so that a cube has the same numerical value for it volume, surface area and total edge length?
Cut off three right angled isosceles triangles to produce a
pentagon. With two lines, cut the pentagon into three parts which
can be rearranged into another square.
Determine the total shaded area of the 'kissing triangles'.
What is the area of the quadrilateral APOQ? Working on the building
blocks will give you some insights that may help you to work it
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. . . .
Which is a better fit, a square peg in a round hole or a round peg
in a square hole?
Can you find the area of a parallelogram defined by two vectors?
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. . . .
What is the same and what is different about these circle
questions? What connections can you make?
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 are the areas of these triangles? What do you notice? Can you generalise to other "families" of triangles?