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There are some key words that you need to know for circles: radius, circumference, diameter, sector, segment, tangent, chord and arc. In this video you will discover what they all mean.

This video discusses the topic of circles.

This video explains the equation of a circle.

This video explains how pie charts can be used to display data in a more 'user-friendly' way.

This YouTube video elaborates on what weather is and what causes changes in the weather.