Since the sum of the angles in a triangle is \( 180^\circ \), we can find angle \( A \) by subtracting the measures of angles \( B \) and \( C \) from \( 180^\circ \).
\[
A = 180^\circ - B - C = 180^\circ - 38^\circ 40' - 91^\circ 40'
\]
Convert the angles to
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