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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.

Video 1: Introduces the concepts of points, lines, rays and line segments
Video 2: Provides examples of points, lines, line segments and rays
Video 3: Common mistakes made

An interactive activity on finding the union of sets.