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Here are some specific activities, investigations or visual aids we have picked out. Click anywhere in the grey area to access the resource.

• Circle Parts A visual aid for a teacher to use while describing the components of a circle.
• How did they figure out the area of a circle? How did they figure out the area of a circle is pi times r squared? A video from Mind Your Decisions.
• Circles Area and Circumference Video The circumference and area of a circle can be found if the radius or diameter are known.
• Circles Practise using pi to calculate various circle measurements. There are six levels of difficulty.

Here are some exam-style questions on this statement:

• "The diagram shows a right-angled triangle and a semicircle. The straight side of the semicircle is the same length as the longest side of the triangle." ... more
• "An ornamental lake is in the shape of a semicircle with a diameter of 900 metres." ... more
• "The diagram shows a sector of a circle, centre O, with one angle shown as being 110°. If the radius of the circle is 8cm calculate:" ... more
• "A yellow equilateral triangle has been painted on a purple sector. The side OC is 20cm and OA is 12cm. Calculate the area of the purple region ABCD as a percentage of the area of the whole sector OCD." ... more
• "The diagram shows a sector of a circle with sector angle 160° and radius 18 cm." ... more
• "A circle is drawn inside a square so that it touches all four sides of the square." ... more
• "OAB is a sector of a circle with centre O and radius 10 cm." ... more
• " " ... more
• "Three crayons are held together with an elastic band. The diagram below shows the end of the crayons and the elastic band." ... more
• "The following diagram shows a circle with centre O and radius 9 cm." ... more
• "Two identical small yellow circles are drawn inside one large circle, as shown in the diagram. The centres of the small circles lie on the diameter of the large circle. The part of the large circle that is outside both small circles is painted red." ... more

See all these questions

Here is an Advanced Starter on this statement:

• Pizza Slice
  A problem which can be solved by considering the areas of a triangle and a sector of a circle. more

Click on a topic below for suggested lesson Starters, resources and activities from Transum.

• Circles 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.