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cogitating brain Puzzle of the Month
Problème du Mois / Problema del Mese

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Puzzle # 125  Italiano italiano Français francais
Difficulty level: bulbbulb, general math knowledge.
helm of MarsA mathematical shield
  
Once upon a time, Mars, the God of war, intended to test the IQ of the goddess Minerva. So, showing his shield, he told her: "Darling, on my shield, there are 3 equal circles which represent the qualities of the warrior: strength, flexibility, and decisiveness. As you can see, one of the circles has been scratched by a sword, and the resulting score is three inches long (line AB in the illustration). Can you then tell me what is the area of my shield?".
Find the very shortest way to solve this puzzle and use only basic geometry, trigonometry is not allowed!

puzzle of the month
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Keywords: inscribed circles, incircles.

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