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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.

Density of a solid for a regular shaped body. Definition, meaning and its simple calculation

This video explains the equation of a circle.

This online tutorial will provide you with some guidelines on how to interpret both topographic and geologic maps.