6So is a bit more than 3. once across twice across three times across Pi is the number of times you must travel straight across the circle to go the same distance as all the way round the circle.Click to see the pathsonce acrosstwice acrossthree times acrossand a bit further!So is a bit more than 3.
7How can we be sure that is a bit more than 3? 213For a regular hexagon, the distance all the way round is exactly 3 times the distance straight across the middle.Click to see the paths
8Circumference = × Diameter And all the way round the circle is a little bit more than all the way round the hexagon.So all the way round the circle is a little bit more than 3 times straight across the middle.Click to see the pathsCircumference = × Diameter
92 1 3 Summary Circumference = × Diameter Circumference = times the diameterClick to see the paths…and a little bit moreCircumference = × Diameter
10Find it at http://www.uk.sagepub.com Now watch PP 10-2: The Area of a Circle from the CD inside Teaching Mathematics Visually and ActivelyFind it atTandi Clausen-May