Circumference of a Circle

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Presentation transcript:

Circumference of a Circle Learning Objective: to be able to calculate the circumference of a circle from its radius or its diameter

Match the Perimeter to the Shapes Delta 4cm 8cm Perimeter A 32cm B 21cm C 26cm D 29cm E 22cm F 24cm G 25cm Square 8cm Equilateral Triangle 7cm Kite 8cm 3cm Trapezium 7.5cm 1.5cm 10cm Isosceles Triangle 10cm 5cm Parallelogram 8cm 5cm

Create a Table in your Exercise Books The perimeter of a circle is called the circumference. Measuring Circles Circle Circumference Diameter Circumference ÷ Diameter

Approximation of the Circumference of a Circle

The Circumference of a Circle The circumference is always a multiple of the diameter. The number is always the same: 3.14159... It is called Pi and we write it as . The number goes on forever after the decimal point. We normally round it to 3.14. It is on your calculator and is more accurate there. Calculate using

What is the Circumference of these Circles? 7mm 100m

Work out the Perimeters A B 2m 4cm 10cm C 15cm D 8m 17m F 47mm E G 12m 18m H 8m

Basketball Court Mr McTernan and Mr Océan have been asked to lay out a new basketball court with tape. Tape comes in rolls of 20m. How many rolls do they need to order? Assuming they make no errors, how much tape will be left over? All measurements are in metres.