   
It says 9-15 on the cover but the program displays 12 to 16 which is probably nearer the mark. This set essentially covers basic Geometry. Angles, triangles, rectangles, circles and sin/cos/tan all get a mention in the form of diagrams and information on how to perform the calculations. The revision section at the end is where one tests to see if it's all sunk in.
TAU
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