The Cross Ratio
One of the most famous free kicks ever taken - but how far from the goal was Brazil's Roberto Carlos?
Discussed by Federico Ardila from San Francisco State University.
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The goal was scored by Carlos in a 1-1 drawn between France and Brazil at the Stade de Gerland, Lyon, on 3 June 1997 - it was game one of the "1997 Tournoi de France".
Goal animation by Pete McPartlan
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