9. Unlike the Portuguese, who had rounded Africa and were sailing east toward Asia, Christopher Columbus decided to sail ____________________ His decision was based on his estimates of the ____________________circumference and the sizes of ____________________ and ____________________ Unfortunately, Columbus ____________________ the former and ____________________ the latter. Although this resulted in a much longer voyage than he anticipated, his estimates probably helped convince ____________________ and ____________________, the two Spanish monarchs who sponsored his voyage.