Question 1170876
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The missed coordinate is the POSITIVE value of this square root


    {{{sqrt(1-(-5/7)^2)}}} = {{{sqrt((49-25)/49)}}} = {{{sqrt(24)/7}}} = {{{(2*sqrt(6))/7}}} = 0.699854...  or simply 0.7 (rounded).    <U>ANSWER</U>
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Solved, answered, explained and completed.