Question 1123686
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The two arcs for corresponding central angles must be of equal length:


    {{{(2/3)*(2*pi)*10}}} = {{{alpha*6}}} inches  ====>


    {{{alpha}}} = {{{(2/3)*(2pi)*10*(1/6)}}} radians = {{{(40/18)*pi}}} = {{{(20/9)*pi}}} radians = {{{2}}}{{{2/9}}}.{{{pi}}} radians = 400 degrees.
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