Circle Pairs
Find the matching pairs of circle diagrams and circle properties in this interactive online game.
Circles
Practise using pi to calculate various circle measurements. There are six levels of difficulty.
Pi-Mon
Memorise the digits of pi with help from some musical notes.
In Terms of Pi
Circle related questions requiring the answer to include a multiple of pi rather than an approximation.
Circle Theorems Exercise
Show that you understand and can apply the circle theorems with this self marking exercise.
Circle Theorem Pairs
A pairs game based around ten theorems about the angles made with chords, radii and tangents of circles.
Proof of Circle Theorems
Arrange the stages of the proofs for the standard circle theorems in the correct order.
Geometry Toolbox
Create your own dynamic geometrical diagrams using this truly amazing tool from GeoGebra.
Circle Equations
Recognise and use the equation of a circle with centre at the origin and the equation of a tangent to a circle.
This is the main Transum help video on Circles.
Circle Drawing Champion
A teacher draws a perfect freehand circle of diameter one metre in less than a second.
Circle Facts Song
A free trial lesson from Math Upgrade dot com.
Circle Song
This song helps students remember circle terminology (radius & diameter) and the formulas for area and circumference.
Circles Area and Circumference Video
The circumference and area of a circle can be found if the radius or diameter are known.
Circumference
How does the circumference of a glass compare to the height of the glass? You'll be surprised when you find out.
Pi Song
Kate Bush sings the digits of pi (audio only).
Pi
Some information about Pi, the "celebrity number'. A video features maths-loving author Alex Bellos.
A Brief History of Pi
A video from Simon Clark presenting a deep but accessible account of the history of pi.
Facts You Should Know About Pi
Mathematician Presh Talwalkar explains five facts you should know about pi.
Pi and Four Fingers
Why is The Simpsons not in Base 8? In this video Simon Singh talks about Pi and Maths in The Simpsons cartoon.
Origin of Degrees and Radians
Exploring why a full rotation is 360 degrees and, why using radians can be a more useful alternative.
Circle Parts
A visual aid for a teacher to use while describing the components of a circle.
Circle Parts Kim's Game
A memory game to be projected to help the whole class revise the names for the parts of a circle.
Long Pi
One thousand digits of pi displayed on a full page ready to be projected for the whole class to see.
Angle Theorem Kim's Game
A memory game to be projected to help the whole class revise the circle angle theorems.
Circle Theorems
Diagrams of the circle theorems to be projected onto a white board as an effective visual aid.
Geometry Toolbox
Create your own dynamic geometrical diagrams using this truly amazing tool from GeoGebra.
Pi Day
March 14th is Pi Day. The third month and the 14th day relates to 3.14 which is pi to three significant figures. How many figures of pi can you memorise?
Refreshing Revision
It is called Refreshing Revision because every time you refresh the page you get different revision questions.
Square Circle Kite
Write down the names of all the mathematical shapes you know.
23 items are currently in this category.
Teachers might find the complete Circles Topic List useful.
This is all to do with pi and why it is such an important number. From finding the circumference and area of circles to problem solving and investigation.
Pupils will begin by learning the names of the parts of a circle then, either through investigation or practical activity, discover that the circumference of a circle is always just a little more than three times the length of the diameter whatever the size of the circle. A brief walk through history leads them to find out how to use this knowledge (and a more accurate version of pi) to find the circumference and areas of circles. This can then be developed to find the area of a sector, area of a segment, area of an annulus and the area of the region between a circle and a square in more complex problem solving situations.
More mathematics related to the circle can involve angle theorems, loci and algebra.
