lunes, 16 de enero de 2017

1140. The windmill blades

    Pepe Chapuzas had drawn something like the blades of a windmill...

    The callenge was to calculate the sum of the blue angles... Chicho Madeja calculated it...

    Dear Teacher:
BLUE + RED = 5 · 180° = 900°
RED + GREEN = 360°
RED = GREEN
RED = 180°
BLUE = 900°  RED = 900°  180° = 720°

    

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