Find the cosine of 38 degrees and then find its reciprocal.
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A pair of supplementary angles add up to 180 degrees. Therefore, the supplement to a 38 degree angle is equal to 180 - 38 = 142 degrees.
The measure of angle b would depend on the sum of the angles a and b which has not been given so therefore a solution is not possible.
Angles do not have lengths. They are measured in terms of rotation about the vertex.
52 degrees
9.5