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Looking for a challenging algebra text? Preparing for MATHCOUNTS or the AMC exams?
Check out Art of Problem Solving's Introduction to Algebra by Richard Rusczyk.
Art of Problem Solving Animated Proofs Gallery

 
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The above image illustrates the fact that of all triangles inscribed in a given triangle, the one with least perimeter connects the feet of the given triangle. You can click and drag several of the points in the diagram - try it and see!
     
Looking for a challenging geometry text? Preparing for MATHCOUNTS or the AMC exams? Check out Art of Problem Solving's Introduction to Geometry by Richard Rusczyk.
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