Question 1116591
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A radius to a point of tangency is perpendicular to the tangent, so MS is perpendicular to AS.<br>
AM is then the hypotenuse of right triangle SAM, so<br>
{{{MS^2+AS^2=AM^2}}}
{{{5^2+AS^2 = 12^2}}}
{{{25+AS^2 = 144}}}
{{{AS^2 = 119}}}
{{{AS = sqrt(119)}}}