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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.

Part 1: Comparing like and unlike fractions
Part 2: Examples of comparing like and unlike fractions
Part 3: Common mistakes made when comparing fractions

This YouTube video delves into the impact that tourism can have on a country's economy.

This YouTube video delves into the impact that tourism can have on the environment.

This video explains the equation of a circle.

Fraction comparison with lowest common denominators.

This video explains how to order fractions by their size.

This video explains how to calculate the gradient (slope) of a straight line.

This YouTube video explains how to calculate an irregular area on a map.