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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 online tutorial will explain the earth's shape and its hemispheres.

This video explains the equation of a circle.

This 20 minute YouTube video explores the differences between small and large scale agriculture and the uses of each.