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A study in cross ratios
An excellent training about Math
Projective Problem Solving
Solving geometry problems using projective geometry is very satisfying. Here we go through the very concrete calculations involved in using cross ratios to solve problems. This can be regarded as a beginners guide to the theory projective geometry or an advanced guide to problem solving in geometry. In principle this can be learned as soon as one learns the sine rule. Hopefully one day the student of this course will be ready to tackle the course on projective geometry which deals with the axioms and has a more abstract presentation.
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