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Preview of How high is that tree?
How high is that tree?
Screenshot of How JPEG works
How JPEG works
Screenshot of How the Metre Became the Metre
How the Metre Became the Metre
Screenshot of How to measure a tree using a stick and some simple maths
How to measure a tree using a stick and some simple maths
Preview of How wide is No Man’s Land?
How wide is No Man’s Land?
Screenshot of HTML5 Applet to Explore the Unit Circle and Trigonometric Functions
HTML5 Applet to Explore the Unit Circle and Trigonometric Functions
Preview of Identifying the Sides Worksheet
Identifying the Sides Worksheet
Screenshot of Impossible Triangles
Impossible Triangles
Screenshot of Interactive trig graphs
Interactive trig graphs
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