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¹ Lee, J.Y. (2013). “Private tutoring and its impact on students' academic achievement, formal schooling, and educational inequality in Korea.” Unpublished doctoral thesis. Columbia University.
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. If one side has the length 
, and another side has the length 
, what is the length of the third side?
and two of the sides are given in the figure below, what is the length of the third side?