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In the circumference of center O, ABCD is a rectangle, arc (AB) = 60º, the radious measeaure is 4 cm, ¿ what measure have the grey area?

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In the circumference of center O, ABCD is a rectangle, arc (AB) = 60º, the radious measeaure is 4 cm, ¿ what measure have the grey area?

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