Circle Facts Song
A free trial lesson from Math Upgrade dot com.
This song helps students remember circle terminology (radius & diameter) and the formulas for area and circumference. Complete with pictures from an industry that manufactures lots of circles.
Kate Bush sings the digits of pi (audio only).
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Teachers might find Circles Lesson Starters 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.