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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 looks at the exterior angles of polygons.

This online tutorial guides you through what information a map shows, map legends and the different types of maps which are available.

This video explains what polygons are.